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:
Women gain ____ years per child they had.\Question: Choose the right answer from options given a) ten b) nine c) four d) two

Ex Output:
d


Ex Input:
People can go without food for up to about ____ weeks.\Question: Choose the right answer from options given a) three b) one c) nine d) four

Ex Output:
a


Ex Input:
Humpbacks come in ____ different colors, ranging from white to black to mottled.\Question: Choose the right answer from options given a) four b) five c) six d) nine

Ex Output:

a