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]: Chinese cuisine has ____ tolerance for animal rights groups.\Question: Choose the right answer from options given a) ten b) zero c) four d) no
[EX A]: b

[EX Q]: Brachiopods are superficially similar to bivalves, both having ____ shells.\Question: Choose the right answer from options given a) two b) eight c) seven d) one
[EX A]: a

[EX Q]: Sexual maturity is reached at ____ to five years.\Question: Choose the right answer from options given a) five b) one c) zero d) three
[EX A]:
d