Question: who is the lead singer of the Belgian band K's Choice, Marcus Cooper or Sarah Bettens ?

Context paragraphs:
Dylan Rice: Dylan Rice (born 1976) is a Chicago-based singer-songwriter and guitarist, who grew up in Salt Lake City, Utah.  In May 2007 his song "The Lie" was included in the Columbia Records CD compilation "Music with a Twist: Revolutions", along with The Gossip, Sarah Bettens (K's Choice), and Ivri Lider.  His debut CD, "Wandering Eyes", was produced by former Acme engineer Blaise Barton (Bob Dylan, Liz Phair).  Styx bassist Chuck Panozzo collaborated with Rice on a demo tape in 2002.

Cocoon Crash: Cocoon Crash is the third studio album of the Belgian band K's Choice, released in 1998.  Its singles were "Believe", "Everything for Free", and "If You're Not Scared".  Musically, it is comparable to their second album, "Paradise in Me", though with a generally lighter tone and subject matter.

Sarah Bettens: Sarah Bettens (born 23 September 1972) is the lead singer of the Belgian band K's Choice.  Sarah and her brother Gert Bettens are the two best-known faces of the band.  She is known for her enigmatic, husky voice.  The band is popular in Belgium, the Netherlands and France, and has toured in the U.S. with The Verve Pipe, Tonic, Alanis Morissette and the Indigo Girls, as well as on their own.  Bettens has maintained a successful solo career as well by providing vocals for movie soundtracks, including "Underworld", "Wild Things", "Zus and Zo" and more recently "Leef! ".

K's Choice: K's Choice is a Belgian rock band from Antwerp, formed in the mid-1990s.  The band's core members are siblings Sarah Bettens (lead vocals, guitar) and Gert Bettens (guitar, keyboard, vocals).  They are joined by Bart Van Lierde (bass), Tom Lodewyckx (lead guitar), Reinout Swinnen (keys) and Wim Van Der Westen (drums).  The band has produced gold and platinum albums.

Marcus Cooper: Marcus Cooper (born February 1, 1990) is an American football cornerback for the Chicago Bears of the National Football League (NFL).  He was drafted by the San Francisco 49ers in the seventh round of the 2013 NFL Draft.  He played college football for Rutgers University.  Cooper has also played for the Kansas City Chiefs and Arizona Cardinals.

Paradise in Me: Paradise in Me is the second studio album by Belgian band K's Choice.  It was released in 1995 by Double T Music.  In the United States, it was released on 20 August 1996 by 550 Music.

Gert Bettens: Gert Bettens (born 19 March 1970) is the lead guitarist of the Belgian band K's Choice.  He, with his sister Sarah Bettens, is the face of the band.

The Great Subconscious Club: The Great Subconscious Club is the debut album of the Belgian band K's Choice recorded in 1994.  It was originally produced under the name The Choice, but the band changed names.  "Me Happy", "Breakfast", "I Smoke a Lot" and "The Ballad of Lea & Paul" were released as singles.  The name of the album is taken from the lyrics to the song "Try To Get Some Sleep", the B-side of "I Smoke a Lot", which also appeared on the compilation Extra Cocoon.  At this time the band merely existed out of Sarah and Gert Bettens, who were joined by others (who didn't return for any of the later albums of K's Choice).

Dom Kelly: Dom Kelly is the drummer/vocalist and a founding member of Charleston, SC-based rock band A Fragile Tomorrow.  In 2017, he will be releasing his debut solo album on MPress Records.  The album features appearances from Emily Saliers of Indigo Girls, Lucy Wainwright Roche, Chris Trapper of The Push Stars, Sarah Bettens of K's Choice, Doris Muramatsu of Girlyman, and his identical brother and A Fragile Tomorrow bandmate Sean Kelly.

Eric Grossman: Eric Grossman (born November 25, 1964, New York) is an American musician, best known for playing bass and recording gold and platinum albums with the Belgian band K's Choice.

Supporting paragraphs: Sarah Bettens Marcus Cooper
Answer: Sarah Bettens