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: Nymphs feed and mature through five instars in about ____ to eight weeks.\Question: Choose the right answer from options given a) six b) five c) seven d) zero

Output: a


Input: Consider Input: Tigers vary in length from three to ____ meters.\Question: Choose the right answer from options given a) four b) seven c) nine d) five


Output: d