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').

Vision problems affect one in ____ school-aged children.\Question: Choose the right answer from options given a) six b) four c) seven d) one
b

Most spiders have ____ eyes and eight legs.\Question: Choose the right answer from options given a) eight b) five c) no d) three
a

Sexual maturity is reached at three to ____ years.\Question: Choose the right answer from options given a) two b) nine c) five d) seven

c