The correct answer is C.
Sanchit was standing across the road and was waiting for me. When he saw me, he waved to me. I could not understand what he was saying because the moving vehicles were making so much noise.
Here is a brief explanation of each option:
- Option A is incorrect because the simple past tense is used to describe actions that happened at a specific time in the past. In this sentence, the actions of Sanchit standing, waiting, seeing, waving, saying, and the vehicles making noise are all happening at the same time, so the simple present tense should be used.
- Option B is incorrect because the past participle is used to form the perfect tenses. In this sentence, the perfect tenses are not needed because the actions are all happening at the same time.
- Option C is correct because the simple present tense is used to describe actions that are happening at the same time. In this sentence, the actions of Sanchit standing, waiting, seeing, waving, and saying, and the vehicles making noise are all happening at the same time.
- Option D is incorrect because the past perfect tense is used to describe actions that happened before another action in the past. In this sentence, there is no action that happened before the other actions, so the past perfect tense is not needed.