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]: Nymphs feed and mature through ____ instars in about six to eight weeks.\Question: Choose the right answer from options given a) four b) eight c) five d) no
[A]: c


[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]: Flea larvae metamorphose through ____ stages before spinning a cocoon and entering the pupal stage .\Question: Choose the right answer from options given a) zero b) one c) four d) three
[A]:
c