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').

Ex Input:
Water is present in all ____ phases in Earth s atmosphere.\Question: Choose the right answer from options given a) six b) nine c) two d) three

Ex Output:
d


Ex Input:
Some taxonomists classify only ____ species though.\Question: Choose the right answer from options given a) one b) six c) two d) three

Ex Output:
c


Ex Input:
Most women can become pregnant in about ____ to three months after they stop taking the pill.\Question: Choose the right answer from options given a) one b) ten c) two d) four

Ex Output:

a