Question: Fred Guiol adapted Edna Ferber's novel into a film directed by whom?
Context: Fred Guiol (February 17, 1898 – May 23, 1964) was an American film director and screenwriter.  Guiol worked at the Hal Roach Studios for many years, and directed Laurel and Hardy's earliest short films, as their famous comic partnership gradually developed during 1927.  Along with Ivan Moffat, he was nominated for an Academy Award for Writing Adapted Screenplay for adapting Edna Ferber's novel "Giant" into the film "Giant". Ivan Romilly Moffat (18 February 1918 – 4 July 2002) was a British screenwriter, film producer and socialite who, with Fred Guiol, was nominated for an Academy Award for Best Adapted Screenplay for adapting Edna Ferber's eponymous novel into the film "Giant" (1956).  Moffat was the grandson of actor-manager Sir Herbert Beerbohm Tree. Silly Billies is a 1936 American comedy film directed by Fred Guiol from a screenplay by Al Boasberg and Jack Townley, based on a story by Guiol and Thomas Lennon.  The film was the twentieth feature for the comedy duo of Wheeler and Woolsey (Bert Wheeler and Robert Woolsey), and also stars Dorothy Lee, who had been in a number of their films.  It was released by RKO Radio Pictures on March 20, 1936. Cimarron is a novel by Edna Ferber, published in 1929 and based on development in Oklahoma after the Land Rush.  The book was adapted into a critically acclaimed film of the same name in 1931 through RKO Pictures.  In 1960, the story was again adapted for the screen by MGM, to meager success. The Rainmakers is a 1935 American comedy film directed by Fred Guiol from a screenplay by Grant Garrett and Leslie Goodwins, based on a story by Guiol and Albert Traynor.  RKO Radio Pictures released the film on October 25, 1935, starring the comedy team of Wheeler & Woolsey (Bert Wheeler and Robert Woolsey) and Dorothy Lee. The Nitwits is a 1935 American comedy film directed by George Stevens from a screenplay written by Fred Guiol and Al Boasberg, based on a story by Stuart Palmer.  Released by RKO on June 7, 1933, the film stars the comedy duo of Wheeler & Woolsey (Bert Wheeler and Robert Woolsey), with featured roles being filled by Fred Keating, Betty Grable, Evelyn Brent and Erik Rhodes. Dinner at Eight is a 1933 American pre-Code comedy-drama film directed by George Cukor.  Adapted to the screen by Frances Marion and Herman J. Mankiewicz from George S. Kaufman and Edna Ferber's play of the same name, it features an ensemble cast of Marie Dressler, John Barrymore, Wallace Beery, Jean Harlow, Lionel Barrymore, Lee Tracy, Edmund Lowe, and Billie Burke. Show Boat is a 1936 romantic musical film directed by James Whale, based on the musical of the same name by Jerome Kern and Oscar Hammerstein II, which in turn was adapted from the novel of the same name by Edna Ferber. Giant is a 1956 American epic Western drama film, directed by George Stevens from a screenplay adapted by Fred Guiol and Ivan Moffat from Edna Ferber's 1952 novel.  The film stars Elizabeth Taylor, Rock Hudson and James Dean and features Carroll Baker, Jane Withers, Chill Wills, Mercedes McCambridge, Dennis Hopper, Sal Mineo, Rod Taylor, Elsa Cardenas and Earl Holliman.  "Giant " was the last of James Dean's three films as a leading actor, and earned him his second and last Academy Award nomination – he was killed in a car accident before the film was released.  Nick Adams was called in to do some voice dubbing for Dean's role. Show Boat is a 1951 American musical romantic drama film, based on the stage musical of the same name by Jerome Kern (music) and Oscar Hammerstein II (script and lyrics), and the 1926 novel by Edna Ferber.  It was made by MGM, adapted for the screen by John Lee Mahin, produced by Arthur Freed and directed by George Sidney.
Answer: George Stevens