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 infected persons have ____ symptoms of disease.\Question: Choose the right answer from options given a) six b) no c) three d) one
[A]: b


[Q]: Some families have two daddies or ____ mommies.\Question: Choose the right answer from options given a) nine b) seven c) zero d) two
[A]: d


[Q]: Asterisks indicate conserved amino acids among the ____ species.\Question: Choose the right answer from options given a) three b) six c) five d) zero
[A]:
a