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]: Ostriches have ____ stomachs.\Question: Choose the right answer from options given a) four b) nine c) eight d) three
[A]: d


[Q]: All birds have ____ legs with four toes each.\Question: Choose the right answer from options given a) zero b) one c) three d) two
[A]: d


[Q]: Water exists in ____ states.\Question: Choose the right answer from options given a) three b) six c) zero d) eight
[A]:
a