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]: Tilt consists of ____ small surface vents.\Question: Choose the right answer from options given a) zero b) three c) seven d) no
[A]: b


[Q]: Chlorine is manufactured in ____ ways.\Question: Choose the right answer from options given a) four b) two c) nine d) seven
[A]: b


[Q]: Most adults sleep between seven and ____ hours a night.\Question: Choose the right answer from options given a) five b) eight c) three d) zero
[A]:
b