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:
Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four

Ex Output:
b


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:
Fund is a ____ character code describing the source of funding for a transaction.\Question: Choose the right answer from options given a) four b) two c) six d) one

Ex Output:

c