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]: Teething begins for most babies around ____ to six months.\Question: Choose the right answer from options given a) three b) four c) five d) seven
[A]: b


[Q]: Perennial grass takes ____ to five years before it is mature enough to produce adequate seed.\Question: Choose the right answer from options given a) six b) zero c) three d) no
[A]: c


[Q]: Infant communities are very special environments for toddlers aged approximately one to ____ years.\Question: Choose the right answer from options given a) one b) six c) four d) three
[A]:
d