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:
Manatees swim two to ____ miles per hour.\Question: Choose the right answer from options given a) no b) six c) five d) zero

Ex Output:
b


Ex Input:
Ozone is a naturally occurring molecule containing ____ atoms of oxygen.\Question: Choose the right answer from options given a) three b) five c) nine d) eight

Ex Output:
a


Ex Input:
Most butterflies live only ____ to four weeks.\Question: Choose the right answer from options given a) one b) two c) five d) four

Ex Output:

b