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]: Cleavage occurs typically in either one, two, three, four, or ____ directions.\Question: Choose the right answer from options given a) six b) three c) ten d) two
[EX A]: a

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

[EX Q]: Most amphibians also have ____ limbs.\Question: Choose the right answer from options given a) one b) six c) four d) five
[EX A]:
c