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: Couples often date from one to ____ years before getting engaged.\Question: Choose the right answer from options given a) three b) nine c) eight d) seven

Output: a


Input: Consider Input: Unmarried women are four to ____ times more likely to abort than married.\Question: Choose the right answer from options given a) five b) seven c) eight d) six


Output: a