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]: Some male fish return after just ____ years.\Question: Choose the right answer from options given a) no b) two c) one d) six
[A]: b


[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]: Buttercups have five to ____ petals or sepals.\Question: Choose the right answer from options given a) five b) six c) no d) ten
[A]:
b