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 birds have ____ toes, three that face forward and one rearward.\Question: Choose the right answer from options given a) two b) ten c) nine d) four
[A]: d


[Q]: Corms are undifferentiated, uniform, and contain ____ rings when cut apart.\Question: Choose the right answer from options given a) no b) three c) one d) zero
[A]: a


[Q]: Birds have absolutely ____ ideas about human gender.\Question: Choose the right answer from options given a) ten b) no c) eight d) four
[A]:
b