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]: Organisms have ____ forms of nucleic acid.\Question: Choose the right answer from options given a) four b) three c) two d) one
[A]: c


[Q]: Bone marrow replenishes itself fully within ____ weeks.\Question: Choose the right answer from options given a) nine b) no c) one d) two
[A]: d


[Q]: Most people have twenty nails, ten on the fingers and thumbs, and ____ on the toes.\Question: Choose the right answer from options given a) nine b) three c) ten d) eight
[A]:
c