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:
Voles are prolific breeders and can produce four to ____ litters a year.\Question: Choose the right answer from options given a) four b) two c) six d) three

Ex Output:
c


Ex Input:
Sea stars have ____ arms, or rays, connected to a small round body.\Question: Choose the right answer from options given a) five b) six c) seven d) no

Ex Output:
a


Ex Input:
Stripers reach maturity at approximately ____ years of age.\Question: Choose the right answer from options given a) zero b) five c) one d) three

Ex Output:

d