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').

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

Some taxonomists classify only ____ species though.\Question: Choose the right answer from options given a) one b) six c) two d) three
c

Hagfishes have pinkish gray wormlike bodies and ____ or six short tentacles around their mouths.\Question: Choose the right answer from options given a) six b) one c) ten d) four

d