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:
ATMs are expensive machines with an average useful life of ____ to fifteen years.\Question: Choose the right answer from options given a) nine b) eight c) ten d) two

Ex Output:
c


Ex Input:
Notebooks are laptop computers that weigh between five and ____ pounds.\Question: Choose the right answer from options given a) ten b) seven c) nine d) one

Ex Output:
b


Ex Input:
Most infants are sleepy for the first ____ days.\Question: Choose the right answer from options given a) nine b) two c) ten d) three

Ex Output:

b