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 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
[A]: c


[Q]: Most toddlers find it hard to sit still for more than a few seconds, let alone ____ minutes.\Question: Choose the right answer from options given a) no b) three c) four d) zero
[A]: b


[Q]: Antidepressants have ____ distinct mechanisms of action.\Question: Choose the right answer from options given a) no b) eight c) seven d) four
[A]:
c