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').

Input: Consider Input: Birds reach sexual maturity in three to ____ years.\Question: Choose the right answer from options given a) seven b) two c) five d) six

Output: c


Input: Consider Input: Most volcanoes erupt for ____ to four weeks and then rest.\Question: Choose the right answer from options given a) three b) four c) one d) eight

Output: a


Input: Consider Input: Hellbenders have four toes on their front feet and ____ on their hind feet.\Question: Choose the right answer from options given a) zero b) four c) ten d) five


Output: d