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]: Trappers have ____ genders and reproduce sexually.\Question: Choose the right answer from options given a) zero b) two c) five d) one
[A]: b


[Q]: Calves can swim ____ days after they are born.\Question: Choose the right answer from options given a) ten b) two c) zero d) one
[A]: b


[Q]: Acute pain is pain for ____ weeks or less.\Question: Choose the right answer from options given a) seven b) six c) three d) no
[A]:
b