Choose the correct answer:
Rohan … … … … ..the movie before he read the review
 

The phrase "before he read the review" indicates that Rohan's action of watching the movie occurred prior to reading the review. In English grammar, when one action is completed before another in the past, we use the past perfect tense. Therefore, the correct sentence is: "Rohan had watched the movie before he read the review."

Why the other options are incorrect:

• a) watches: This is the simple present tense, which is used for actions happening now or regularly. It doesn't fit the context of the sentence.
• b) have watched: This is the present perfect tense, used for actions that occurred at an unspecified time before now. It doesn't indicate that one action happened before another in the past.
• d) was watching: This is the past continuous tense, used for actions that were ongoing in the past. It doesn't convey that one action was completed before another.