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').

[EX Q]: Hydra has ____ distinct methods of reproduction, asexual and sexual.\Question: Choose the right answer from options given a) two b) zero c) no d) ten
[EX A]: a

[EX Q]: Trains kill ____ people every year.\Question: Choose the right answer from options given a) zero b) three c) no d) four
[EX A]: d

[EX Q]: Individual plants grow seven to ____ inches tall.\Question: Choose the right answer from options given a) two b) ten c) zero d) five
[EX A]:
b