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]: Stroke is the number ____ cause of death in the United States.\Question: Choose the right answer from options given a) ten b) nine c) one d) three
[A]: d


[Q]: Redwoods reproduce ____ ways.\Question: Choose the right answer from options given a) zero b) two c) six d) nine
[A]: b


[Q]: Most infants double their birth weight in ____ months and triple it in a year.\Question: Choose the right answer from options given a) nine b) six c) four d) five
[A]:
b