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]: Cleavage is good in ____ directions forming cubes.\Question: Choose the right answer from options given a) two b) three c) six d) zero
[A]: b


[Q]: Pods contain less than ____ animals, mainly females with calves and sexually immature males.\Question: Choose the right answer from options given a) zero b) six c) no d) ten
[A]: d


[Q]: Nitric oxide serves ____ main functions in the body.\Question: Choose the right answer from options given a) three b) no c) nine d) four
[A]:
a