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: Most gerbils live three to ____ years and have few health problems.\Question: Choose the right answer from options given a) three b) four c) seven d) zero

Output: b


Input: Consider Input: Perennial grass takes three to ____ years before it is mature enough to produce adequate seed.\Question: Choose the right answer from options given a) five b) seven c) six d) four

Output: a


Input: Consider Input: Monasteries have ____ fortifications and are sanctuaries for healing the wounded.\Question: Choose the right answer from options given a) one b) no c) four d) nine


Output: b