TASK DEFINITION: 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').
PROBLEM: Ozone is a naturally occurring molecule containing ____ atoms of oxygen.\Question: Choose the right answer from options given a) three b) five c) nine d) eight

SOLUTION: a

PROBLEM: Roundworms are fairly large worms that can grow to be ____ or five inches long.\Question: Choose the right answer from options given a) no b) nine c) four d) zero

SOLUTION: c

PROBLEM: Monoclinic crystals have ____ axes that are unequal in length.\Question: Choose the right answer from options given a) nine b) eight c) four d) three

SOLUTION:
d