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:
Some species can make dives over ____ hundred feet deep.\Question: Choose the right answer from options given a) six b) eight c) two d) one

Ex Output:
b


Ex Input:
Cigarette smokers are ____ times more likely to die of lung cancer than nonsmokers.\Question: Choose the right answer from options given a) ten b) six c) four d) nine

Ex Output:
a


Ex Input:
Some migraines have ____ headaches at all.\Question: Choose the right answer from options given a) one b) no c) zero d) ten

Ex Output:

b