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: Many comets have ____ tails.\Question: Choose the right answer from options given a) two b) six c) three d) one

SOLUTION: a

PROBLEM: All butterflies go through ____ distinct stages in their lives.\Question: Choose the right answer from options given a) eight b) seven c) four d) three

SOLUTION: c

PROBLEM: Infertility affects one in ____ couples today.\Question: Choose the right answer from options given a) eight b) two c) five d) ten

SOLUTION:
c