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]: Malignant tumors are more dangerous, and survival times can range from ____ months to several years.\Question: Choose the right answer from options given a) one b) no c) ten d) six
[A]: d


[Q]: Wolverines reproduce every ____ or three years.\Question: Choose the right answer from options given a) two b) three c) one d) four
[A]: a


[Q]: Humanity is responsible for five or ____ billion tons a year.\Question: Choose the right answer from options given a) four b) zero c) ten d) six
[A]:
d