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: Psychiatrists say that one in ____ people are mentally ill.\Question: Choose the right answer from options given a) one b) two c) four d) nine

SOLUTION: c

PROBLEM: Rabbits reach sexual maturity between three and ____ months of age.\Question: Choose the right answer from options given a) three b) seven c) six d) zero

SOLUTION: c

PROBLEM: Insomnia is defined as trouble falling asleep or staying asleep and affects one in ____ adults.\Question: Choose the right answer from options given a) seven b) three c) five d) one

SOLUTION:
b