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.
Q: Question: How many Broadway shows did Fred Astaire perform in? Passage:Soon after graduating college, Freedley met Alexander A. Aarons with whom he formed a long term producing partnership. Their first major hit was Lady Be Good! (1924) with music and lyrics by George and Ira Gershwin and featuring Fred Astaire and Adele Astaire. Over the next ten years the pair produced some of the most important works in the Broadway musical canon, featuring some of the most famous songs ever to emerge from the tin pan alley era, part of what is commonly referred to as "The Great American Songbook." The shows that followed included Tip-Toes (1925), Oh, Kay! (1926), and Funny Face (1927), again starring the Astaires. All the scores were written by the Gershwins. In 1928 Aarons and Freedley produced Here's Howe, featuring the music of Gus Kahn, Joseph Meyer, and Irving Caesar; Hold Everything!, with a score by Buddy DeSylva and Lew Brown; and Treasure Girl, with music by the Gershwins. In 1929 followed Spring Is Here and Heads Up!, both with songs by Richard Rodgers and Lorenz Hart. Another Gershwin hit was Girl Crazy (1930). The partnership ended in 1932. Freedley produced 30 shows total on Broadway.
 Links: a. Fred Astaire b. Oh, Kay! c. Adele Astaire d. Gus Kahn
A: 
a