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:
Cooked meat freezes well for up to ____ months.\Question: Choose the right answer from options given a) four b) three c) eight d) five

Ex Output:
b


Ex Input:
Babies are breast-fed until about ____ years of age.\Question: Choose the right answer from options given a) four b) nine c) eight d) two

Ex Output:
d


Ex Input:
Norplant implants prevent pregnancy for up to ____ years.\Question: Choose the right answer from options given a) one b) no c) five d) ten

Ex Output:

c