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 Q]: Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no
[EX A]: a

[EX Q]: 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 A]: c

[EX Q]: Gorillas are sexually mature at six to ____ years of age.\Question: Choose the right answer from options given a) nine b) eight c) one d) three
[EX A]:
a