Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Ex Input:
Bulls can stand as tall as ____ feet at the shoulders.\Question: Choose the right answer from options given a) one b) five c) seven d) four

Ex Output:
b


Ex Input:
Baby elephants are usually dependent on mother s milk for at least ____ years.\Question: Choose the right answer from options given a) six b) three c) two d) seven

Ex Output:
b


Ex Input:
ProFusion is a meta-search engine that submits a query to as many as ____ search engines.\Question: Choose the right answer from options given a) zero b) six c) eight d) nine

Ex Output:

d