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]: Most school aged children pass at least ____ stools per week, with an average of one stool per day.\Question: Choose the right answer from options given a) three b) one c) six d) zero
[A]: a


[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]: Tadpoles emerge about ____ days after fertilization.\Question: Choose the right answer from options given a) three b) six c) eight d) four
[A]:
d