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

Answer: d


Question: Fever usually lasts for an average of ____ days in adults.\Question: Choose the right answer from options given a) zero b) three c) nine d) two

Answer: b


Question: Tumble pigweed is a small plant, about ____ feet high at maturity.\Question: Choose the right answer from options given a) no b) three c) zero d) one

Answer:
b