Question: The Kennedy Center Friedheim prize is awarded by a performing arts center located on which river?

Context paragraphs:
Adrienne Arsht: Adrienne Arsht (born February 4, 1942) is an American philanthropist and business leader.  She is widely recognized for her $30 million contribution to the City of Miami’s Performing Arts Center, now known as the Adrienne Arsht Center for the Performing Arts.  She also serves on the Board of Trustees of the John F. Kennedy Center for the Performing Arts in Washington, D.C.  Through her contributions to the arts, Arsht has become well-known within the three cities she calls home, Miami, New York City and Washington, D.C.

Double Sextet: Double Sextet is a composition by Steve Reich scored for two sextets of flute, clarinet, violin, cello, vibraphone and piano.  It won the 2009 Pulitzer Prize for Music, the first for the composer.  With funds from the Carnegie Hall Corporation, The Abe Fortas Memorial Fund of the John F. Kennedy Center for the Performing Arts, Liverpool Culture Company – European Capital of Culture 2008, The Modlin Center for the Arts at the University of Richmond, Orange County Performing Arts Center, The University of Cincinnati College-Conservatory of Music – Music 08 Festival the piece was commissioned in 2007 by Eighth Blackbird who performed its premiere in 2008, at the University of Richmond in Virginia.  .  The Liverpool Culture Company (Gordon Ross, music programme manager) was the only non-US commissioning organisation and hosted the rest-of-the-world premiere at St. George's Concert Room, Liverpool on the 21st of November 2008 as part of Liverpool's European Capital of Culture celebrations.

Ezequiel Viñao: Ezequiel Viñao (born 1960 in Buenos Aires) is an Argentine-American composer.  He emigrated to the United States in 1980 and studied at the Juilliard School.  His compositions include "La Noche de las Noches" (1989) for string quartet and electronics, which won First Prize at UNESCO's Latin-American Rostrum of Composers in 1993; six "Études" (1993) for piano solo, which were awarded a Kennedy Center Friedheim Award in 1995; a second string quartet "The Loss and the Silence" (2004), commissioned by the Juilliard String Quartet; "The Wanderer" (2005) for a cappella voices, commissioned by Chanticleer and Chicago a cappella, and "Sirocco Dust" (2009), commissioned by the Library of Congress for the St. Lawrence String Quartet.  He currently resides in New York City.

Christopher Rouse (composer): Christopher Rouse (born February 15, 1949) is an American composer.  Though he has written for various ensembles, Rouse is primarily known for his orchestral compositions, including a Requiem, eleven concertos, and four symphonies.  His work has received numerous accolades, including the Kennedy Center Friedheim Award, the Grammy Award for Best Classical Contemporary Composition, and the Pulitzer Prize for Music.  Rouse was the composer-in-residence for the New York Philharmonic from 2012 to 2015.

Kennedy Center Friedheim Award: The Kennedy Center Friedheim Award was an annual award given for instrumental music composition by the John F. Kennedy Center for the Performing Arts in Washington, D.C..  It was established in 1978  and ended in 1995.  The award was given only to American composers.

Symphony (Ran): The Symphony is a symphony for orchestra by the Israeli-American composer Shulamit Ran.  The work was commissioned by the Philadelphia Orchestra in 1987 and was premiered in October 1990.  The piece was awarded the 1991 Pulitzer Prize for Music and took the first place Kennedy Center Friedheim Award that same year.  It was composed in a primarily atonal style.

Concerto for Cello, Piano, and String Orchestra: The Concerto for Cello, Piano, and String Orchestra is a composition for solo cello, piano, and a large string orchestra by the American composer Ralph Shapey.  The work was composed for the cellist Joel Krosnick and the pianist Gilbert Kalish and was first performed at Tanglewood in 1989.  It was first performed by Krosnick, Kalish, and the Berkshire Music Chamber Orchestra under the composer on July 31, 1989.  The piece was a finalist for the 1990 Pulitzer Prize for Music and shared the top Kennedy Center Friedheim Award prize with William Kraft for "Veils and Variations for Horn and Orchestra".

John F. Kennedy Center for the Performing Arts: The John F. Kennedy Center for the Performing Arts (formally called the John F. Kennedy Memorial Center for the Performing Arts, and commonly referred to as the Kennedy Center) is a performing arts center located on the Potomac River, adjacent to the Watergate complex in Washington, D.C.  The Center, which opened September 8, 1971, is a multi-dimensional facility, and as memorial to John F. Kennedy and a cultural center, it produces a wide array of performances encompassing the genres of theater, dance, ballet, and orchestral, chamber, jazz, popular, and folk music, offers multi-media performances for adults and children, and is a nexus of arts education.

Stephen Paulus: Stephen Paulus (August 24, 1949 – October 19, 2014) was a Grammy winning American composer, best known for his operas and choral music.  His best-known piece is his 1982 opera "The Postman Always Rings Twice", one of several operas he composed for the Opera Theatre of St. Louis, which prompted "The New York Times" to call him "a young man on the road to big things".  His style is essentially tonal, and melodic and romantic by nature.  He received grants from the National Endowment for the Arts and Guggenheim Foundation and won the prestigious Kennedy Center Friedheim Prize.  He was commissioned by such notable organizations as the Minnesota Opera, the Chamber Music Society of Lincoln Center, Opera Theatre of Saint Louis, the Saint Louis Chamber Chorus, the American Composers Orchestra, the Dale Warland Singers, the Harvard Glee Club and the New York Choral Society.  Paulus was a passionate advocate for the works and careers of his colleagues.  He co-founded the American Composers Forum in 1973, the largest composer service organization in the U.S., and served as the Symphony and Concert Representative on the ASCAP Board of Directors from 1990 until his death (from complications following a stroke in July 2013) in 2014.

Mark Twain Prize for American Humor: The Mark Twain Prize for American Humor is an American award for humor awarded by the John F. Kennedy Center for the Performing Arts annually since 1998.  It is named after the 19th century novelist, essayist and humorist Mark Twain and is presented to an individual who has made a significant contribution to American humor.  The prize is presented and the show is taped in the Kennedy Center Concert Hall in Washington DC, during which the honoree is celebrated by his or her peers.  The event is a significant fundraiser to benefit the Kennedy Center, which sells tickets as well as access to dinners and after-parties featuring the celebrities.

Supporting paragraphs: Stephen Paulus John F. Kennedy Center for the Performing Arts
Answer: The John F. Kennedy Center for the Performing Arts (formally called the John F. Kennedy Memorial Center for the Performing Arts, and commonly referred to as the Kennedy Center) is a performing arts center located on the Potomac River