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: Paleontologists specialize in ____ main areas.\Question: Choose the right answer from options given a) eight b) five c) no d) six

A: b
****
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: Saddle sores are a common problem after spending six and ____ hours in the sweat and heat.\Question: Choose the right answer from options given a) seven b) four c) one d) two

A:
a
****