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').

[Q]: Most children experience at least one episode by the time they are ____ years old.\Question: Choose the right answer from options given a) eight b) one c) ten d) seven
[A]: d


[Q]: All butterflies go through ____ distinct stages in their lives.\Question: Choose the right answer from options given a) eight b) seven c) four d) three
[A]: c


[Q]: All steroids consist of ____ interlocking rings.\Question: Choose the right answer from options given a) seven b) six c) three d) four
[A]:
d