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]: Calves are born ____ and a half months after mating.\Question: Choose the right answer from options given a) six b) ten c) eight d) two
[A]: c


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


[Q]: Malignant melanoma causes six out of ____ skin cancer deaths.\Question: Choose the right answer from options given a) three b) five c) seven d) two
[A]:
c