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]: Cats have ____ sets of vocal cords.\Question: Choose the right answer from options given a) zero b) nine c) two d) three
[A]: c


[Q]: Roundworms are fairly large worms that can grow to be ____ or five inches long.\Question: Choose the right answer from options given a) no b) nine c) four d) zero
[A]: c


[Q]: Young roosters begin to show colored feathers on their breasts and necks at ____ weeks.\Question: Choose the right answer from options given a) nine b) eight c) ten d) seven
[A]:
b