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: Millipedes have ____ pairs of legs on each body segment.\Question: Choose the right answer from options given a) seven b) ten c) six d) two

A: d
****
Q: Ground squirrels breed once a year, averaging ____ to eight per litter.\Question: Choose the right answer from options given a) seven b) one c) six d) ten

A: a
****
Q: Zygospores result from the fusion of ____ similar hyphal elements.\Question: Choose the right answer from options given a) seven b) six c) two d) eight

A:
c
****