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]: Some experts believe whining peaks around the ages of ____ or four.\Question: Choose the right answer from options given a) three b) no c) four d) seven
[EX A]: a

[EX Q]: Bulls can stand as tall as ____ feet at the shoulders.\Question: Choose the right answer from options given a) one b) five c) seven d) four
[EX A]: b

[EX Q]: Babies can be exclusively breast-fed for their first ____ months of life.\Question: Choose the right answer from options given a) four b) no c) six d) three
[EX A]:
c