Question 6: 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: A lot of (A) discoveries have made (B) in (C) the fields of (D) chemistry and physics.
Knowledge: Passive sentence
Because the sentence has a passive meaning, we use the present perfect passive structure: S + have/ has been Ved/V3
Edit: have made => have been made
A lot of discoveries were made in the fields of chemistry and physics.