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]: Female elephants have babies about ____ years apart, and they have only one each time.\Question: Choose the right answer from options given a) eight b) one c) zero d) three
[EX A]: d

[EX Q]: Piglets normally grow about half their potential growth rate from birth to ____ weeks of age.\Question: Choose the right answer from options given a) zero b) no c) five d) three
[EX A]: d

[EX Q]: Moths have three body parts and ____ legs.\Question: Choose the right answer from options given a) eight b) zero c) three d) six
[EX A]:
d