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').

Input: Consider 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

Output: c


Input: Consider Input: Government buildings fly flags of the ____ nations.\Question: Choose the right answer from options given a) ten b) no c) seven d) two

Output: d


Input: Consider Input: Diatoms consist of ____ shells made of glass silicone dioxide.\Question: Choose the right answer from options given a) four b) one c) five d) two


Output: d