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: Some sources claim there are more like ____ million vertebrate animals in zoos.\Question: Choose the right answer from options given a) six b) five c) one d) three

Answer: b


Question: Nematodes occur in ____ general forms.\Question: Choose the right answer from options given a) nine b) two c) seven d) ten

Answer: b


Question: Trisomy occurs when an individual has ____ of a particular type of chromosome.\Question: Choose the right answer from options given a) no b) three c) one d) five

Answer:
b