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: Sexual reproduction involves ____ parents, one male and one female.\Question: Choose the right answer from options given a) zero b) two c) nine d) four

Output: b


Input: Consider Input: Elephants give birth to one calf every ____ to nine years on average.\Question: Choose the right answer from options given a) no b) four c) three d) seven

Output: b


Input: Consider Input: Dead stalks can remain poisonous for two or ____ seasons.\Question: Choose the right answer from options given a) nine b) three c) one d) ten


Output: b