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]: Rock cavies become sexually mature when they are about one to ____ months old.\Question: Choose the right answer from options given a) one b) four c) three d) seven
[EX A]: c

[EX Q]: All baleen whales have ____ blow holes.\Question: Choose the right answer from options given a) zero b) four c) seven d) two
[EX A]: d

[EX Q]: Birds possess a ____ chambered heart.\Question: Choose the right answer from options given a) ten b) zero c) four d) eight
[EX A]:
c