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: Ants have six legs, and each leg has ____ joints.\Question: Choose the right answer from options given a) nine b) zero c) two d) three

A: d
****
Q: Mosquitoes have ____ distinctive life stages, with the first three stages being spent in the water.\Question: Choose the right answer from options given a) four b) zero c) nine d) five

A: a
****
Q: Most vegetables require moisture to a depth of ____ to eight inches.\Question: Choose the right answer from options given a) seven b) six c) ten d) no

A:
b
****