Here are the correct options for each sentence:

3. Nam wanted to know what time **B. did the movie begin**.
4. Julia said that she **B. was going to** there at noon.
5. Paul asked her **C. whether she got** 20 pounds.
6. He told me **B. to pick** him up at six o'clock.
7. He said that Linda and John **C. were getting** married **D. the next day**.
8. They asked me when **C. I had arrived**.
9. The farmer said, "I didn't see her." → The farmer said **B. I hadn't seen** her.
10. I wondered **D. whether I was doing** the right thing.
11. Charlie **A. told me** that his father was in hospital.
12. Mr. Brown said, "I watched TV last night." → Mr. Brown said that he **C. had watched** TV the night before.
13. The teacher said Columbus **B. had discovered** America in 1492.

If you need further assistance, feel free to ask!