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

[EX Q]: Insects have ____ pairs of legs and three body segments.\Question: Choose the right answer from options given a) one b) nine c) no d) three
[EX A]: d

[EX Q]: Most scientists currently recognize ____ living species of sea turtles grouped into six genera.\Question: Choose the right answer from options given a) zero b) no c) seven d) two
[EX A]:
c