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:
Echinoderms usually have ____ appendages, but there are some exceptions.\Question: Choose the right answer from options given a) ten b) five c) seven d) three

Ex Output:
b


Ex Input:
Fawns weigh about ____ to nine pounds at birth.\Question: Choose the right answer from options given a) five b) ten c) nine d) six

Ex Output:
d


Ex Input:
Logics fall into ____ groups, free logics, foundation systems, and intermediate systems.\Question: Choose the right answer from options given a) nine b) six c) three d) zero

Ex Output:

c