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 skulls show the marks of up to ____ bullets.\Question: Choose the right answer from options given a) five b) three c) eight d) six

Ex Output:
d


Ex Input:
Cyclic neutropenia tends to occur every three weeks and last ____ to six days at a time.\Question: Choose the right answer from options given a) six b) four c) five d) three

Ex Output:
d


Ex Input:
Most hummingbirds raise ____ broods each breeding season.\Question: Choose the right answer from options given a) one b) eight c) two d) seven

Ex Output:

c