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: Meteorologists rely mainly on ____ types of satellites.\Question: Choose the right answer from options given a) four b) two c) ten d) three

Output: b


Input: Consider Input: Ants have six legs, and each leg has ____ joints.\Question: Choose the right answer from options given a) nine b) zero c) two d) three

Output: d


Input: Consider Input: Most leprechauns live to be about ____ hundred years old.\Question: Choose the right answer from options given a) two b) three c) no d) seven


Output: b