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').

Clover leaves with ____ to nine leaflets, illustrating a tendency to mutate.\Question: Choose the right answer from options given a) three b) zero c) ten d) five
a

All quetzals have ____ legs.\Question: Choose the right answer from options given a) four b) zero c) eight d) ten
a

Males mature sexually as soon as ____ years of age.\Question: Choose the right answer from options given a) two b) seven c) five d) eight

a