Question 18: Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions: The more frequent you exercise, the greater physical endurance you will have.
Knowledge: Word type
Adverbs can come before or after a verb (exercise) to add meaning or emphasis.
Double comparison formula: The + superlative + S + V, the + superlative + S + V
Edit: frequent (adj) => frequently (adv)
=> The more often you exercise, the better physical endurance you will have.