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').

Cloves Chew ____ whole cloves.\Question: Choose the right answer from options given a) three b) four c) six d) five
d

Most people require roughly seven to ____ hours of sleep a night to stay alert through the day.\Question: Choose the right answer from options given a) eight b) ten c) one d) five
a

World population reaches ____ billion.\Question: Choose the right answer from options given a) zero b) nine c) six d) ten

c