Question: Robert B. Radnitz was the producer of the 1974 film adaptation of the novel by whom?

Context paragraphs:
And Then There Were None (1974 film): And Then There Were None (a.k.a. Ten Little Indians) is a 1974 film adaptation of Agatha Christie's best-selling 1939 mystery novel of the same name.  The film was directed by Peter Collinson and produced by Harry Alan Towers.

Part 2, Sounder: Part 2, Sounder is a 1976 American drama film directed by William A. Graham.  It is the sequel to the 1972 Oscar-nominated film "Sounder", which in turn is based on William H. Armstrong's Newbery Award-winning novel of the same name.  Although Lonne Elder III and Robert B. Radnitz returned as screenwriter and producer respectively, neither Martin Ritt nor any of the cast members from the first film participated in the sequel, with the exception of Taj Mahal, who reprised his role as Ike and returned as composer.  According to Bob McCann, the film was "barely released."

Steppenwolf (film): Steppenwolf is a 1974 film adaptation of Hermann Hesse's 1927 novel of the same name.  The film made heavy use of visual special effects that were cutting-edge at the time of its release.  It follows the adventures of a half-man, half-animal individual named Harry Haller, who in the Germany of the 1920s, is depressed, resentful of his middle class

Nancy Blackett: Nancy Blackett is a fictional character in nine of the twelve juvenile novels in Arthur Ransome's "Swallows and Amazons series" of books.  She is a bit of a tomboy—acting as captain of the dinghy, "Amazon" and usually directing her friends in their various adventures.  Nancy apparently has no real-world counterpart as an inspirational source for Ransome but appears to be completely the author's creation.  Nancy is sometimes critically viewed as a subversive character for girl readers.  The character appeared in a 1963 BBC television adaptation of "Swallows and Amazons" as well as in a 1974 film adaptation of the book.

Robert B. Radnitz: Robert Bonoff Radnitz (August 9, 1924 – June 6, 2010) was an American film producer best known for his production of the family films "Sounder" and "Where the Lilies Bloom".  He produced several movies, many of which were adapted from children's literature.

The Taking of Pelham One Two Three (1998 film): The Taking of Pelham One Two Three is a 1998 American/Canadian television movie directed by Félix Enríquez Alcalá and starring Edward James Olmos.  It is a television adaptation of the novel of the same name by Morton Freedgood (writing under the pseudonym John Godey), and is a remake of the original 1974 film adaptation.  It was followed by another film remake in 2009.

Shajarur Kanta (2015 film): Shajarur Kanta is a 2015 Byomkesh Bakshi mystery film based on the novel of same name by Sharadindu Bandyopadhyay.  The film is directed by Saibal Mitra, and produced by Pradip Churiwal and Saikat Mitra.  It is the second "Shajarur Kanta" film adaptation in Bengali, another was 1974 film of same name.

Where the Lilies Bloom: Where the Lilies Bloom is a 1974 film adaptation of the novel by the same name, written by Bill and Vera Cleaver.  The film was produced by Robert B. Radnitz and directed by William A. Graham in Watauga County (towns of Boone and Blowing Rock), Ashe County (towns of West Jefferson and Lansing) and in Avery County (towns of Elk Park and Banner Elk), North Carolina.

The Taking of Pelham 123 (2009 film): The Taking of Pelham 123 is a 2009 American thriller film directed by Tony Scott, and starring Denzel Washington and John Travolta.  It is a film adaptation of the novel by Morton Freedgood (writing under the pseudonym John Godey), and is a remake of the original 1974 film adaptation, which was also remade in 1998 as a TV film.  Production began in March 2008, and it was released on June 12, 2009.

Robert B. Redman: Robert B. Redman (September 6, 1908 – June 9, 1960) was an American football, basketball, and baseball player, coach, and educator.  He served as the head football coach at Bloomsburg University of Pennsylvania from 1947 to 1951, compiling a record of 38–4 and winning three Pennsylvania State Athletic Conference champions (1948, 1949, and 1951).  After leaving Bloomsburg, Redman coached football and baseball at East Orange High School in East Orange, New Jersey from 1952 to 1956.  He served as the principal there from 1956 until 1960, when he was named superintendent of schools.  Before assuming that role, Redman died of a heart attack at the age of 51 on June 9, 1960.  Bloomsburg's home football stadium, Robert B. Redman Stadium, was named for the coach when it opened in 1974.

Supporting paragraphs: Robert B. Radnitz Where the Lilies Bloom
Answer: Bill and Vera Cleaver