Choose the sentence that is CLOSEST meaning to the sentence given in each of the following questions

Choose the sentence that is CLOSEST meaning to the sentence given in each of the following questions
Câu 33: We are not sure where we can learn social skills.
A. We are not sure whether to learn social skills.
B. We are not sure whether we could learn social skills.
C. We are not sure where to learn social skills.
D. We are not sure where we could learn social skills.
Câu 34: He said: "I don't understand why she has refused to join us on the trip."
A. He said he hadn't understand why she had refused to join them on the trip
B. He said he didn't understand why she refused to join them on the trip
C. He said I didn't understand why she had refused to join them on the trip
D. He said he didn't understand why she had refused to join them on the trip
Câu 35: The artisan moulded the copper to make a bronze drum.
A. The artisan moulded the copper so that they can make a bronze drum.
B. The artisan moulded the copper because of they want make a bronze drum.
C. The artisan moulded the copper because they want make a bronze drum.
D. The artisan moulded the copper so that they could make a bronze drum.
Câu 36: "Do you know who broke the window, Tom?" the man asked.
A. The man asked Tom if he knew who had broken the window
B. The man asked Tom if he knew who broke the window
C. The man asked Tom whether did he know who had broken the window
D. The man asked Tom if he had known who had broken the window
Choose the best