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').

[EX Q]: Nymphs feed and mature through five instars in about ____ to eight weeks.\Question: Choose the right answer from options given a) six b) five c) seven d) zero
[EX A]: a

[EX Q]: Avian kidneys have ____ kinds of nephrons.\Question: Choose the right answer from options given a) four b) eight c) no d) two
[EX A]: d

[EX Q]: Reversed language begins to develop from as early as ____ months of age.\Question: Choose the right answer from options given a) two b) seven c) no d) four
[EX A]:
d