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: National forests have regulations that restrict ____ wheeler use to established roads.\Question: Choose the right answer from options given a) no b) four c) six d) nine

SOLUTION: b

PROBLEM: Potential energy is divided into ____ different types of energy.\Question: Choose the right answer from options given a) eight b) three c) zero d) two

SOLUTION: b

PROBLEM: Quanta has no mass and takes up ____ space, yet extends out into the universe.\Question: Choose the right answer from options given a) four b) six c) no d) eight

SOLUTION:
c