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:
Vision disorders affect one in every ____ school-age children.\Question: Choose the right answer from options given a) five b) four c) nine d) one

Ex Output:
b


Ex Input:
Cancer is the second leading cause of death in Georgia, accounting for one in ____ deaths each year.\Question: Choose the right answer from options given a) nine b) zero c) five d) four

Ex Output:
d


Ex Input:
Moles breed in late winter or spring and have a gestation period of four to ____ weeks.\Question: Choose the right answer from options given a) four b) one c) six d) three

Ex Output:

c