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').

Piglets normally grow about half their potential growth rate from birth to ____ weeks of age.\Question: Choose the right answer from options given a) zero b) no c) five d) three
d

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

Wheat is an old combination of ____ different species of grass.\Question: Choose the right answer from options given a) ten b) zero c) three d) one

c