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').
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Question: Most females are sexually mature at about ____ to six years.\Question: Choose the right answer from options given a) eight b) nine c) five d) two

Answer: c


Question: Some infected horses show ____ signs and become chronic carriers of the disease.\Question: Choose the right answer from options given a) nine b) six c) four d) no

Answer: d


Question: Pups usually nurse for a year, but some continue to nurse for up to ____ years.\Question: Choose the right answer from options given a) seven b) eight c) three d) four

Answer:
c