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').
--------
Question: Elephants give birth to one calf every ____ to nine years on average.\Question: Choose the right answer from options given a) no b) four c) three d) seven

Answer: b


Question: Women gain ____ years per child they had.\Question: Choose the right answer from options given a) ten b) nine c) four d) two

Answer: d


Question: Most orangutans are ____ to five feet long, some can reach a length of six feet.\Question: Choose the right answer from options given a) zero b) four c) seven d) one

Answer:
b