Definition: In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Input: Question: Why was James Baskett unavailable to play Br'er Fox in Song of the South? Passage:Walt Disney engaged O'Malley to provide voices for animated films such as the Cockney coster in the "Supercalifragilisticexpialidocious" sequence in Mary Poppins (1964); Cyril Proudbottom, Winkie, and a policeman in The Adventures of Ichabod and Mr. Toad (1949); and the role of Colonel Hathi and the vulture Buzzie in The Jungle Book (1967). His voice can be heard in Alice in Wonderland (1951), in which he performs all the character voices in "The Walrus and the Carpenter" segment (besides Alice), including Tweedledum and Tweedledee, the Walrus, the Carpenter, and Mother Oyster. O'Malley also provided the voice of Br'er Fox in Song of the South (1946) when James Baskett was unavailable. Actor Dick Van Dyke has said that O'Malley was his dialect coach on Mary Poppins, attributing his infamous Cockney accent in that film to O'Malley.
Links: a. Dick Van Dyke b. Mary Poppins (film) c. Song of the South d. The Jungle Book (1967 film)
Output:
c