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]: Humans normally produce only ____ sets of teeth.\Question: Choose the right answer from options given a) nine b) eight c) two d) three
[A]: c


[Q]: Photosynthesis occurs in ____ phases.\Question: Choose the right answer from options given a) four b) two c) nine d) five
[A]: b


[Q]: Cats have four paws but only ____ ma.\Question: Choose the right answer from options given a) nine b) no c) six d) one
[A]:
d