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 ____ distinct body parts.\Question: Choose the right answer from options given a) nine b) zero c) no d) three
[A]: d


[Q]: Many scientists believe the neutrino has ____ mass at all.\Question: Choose the right answer from options given a) eight b) zero c) two d) no
[A]: d


[Q]: Time series are annual data for ____ years prior to the latest year.\Question: Choose the right answer from options given a) ten b) one c) four d) five
[A]:
d