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]: Pandas reach adulthood at about ____ years of age.\Question: Choose the right answer from options given a) eight b) seven c) five d) six
[A]: c


[Q]: Nematodes occur in ____ general forms.\Question: Choose the right answer from options given a) nine b) two c) seven d) ten
[A]: b


[Q]: Cockroaches reproduce on an average of ____ times per year.\Question: Choose the right answer from options given a) seven b) four c) one d) ten
[A]:
b