Which of the sentences contain both an independent and a dependent clause?

Question

A.
He was listening intently to the radio, and he didn't hear the doorbell.

B.
As she entered the auditorium, she tripped over a backpack that had been carelessly left in the doorway.

C.
Visiting the aquarium turned out to be quite an adventure; I enjoyed it thoroughly.

D.
We understand the environmental concerns of the farming community, but we are aware that business owners have another point of view.

Answer 1

D.
We understand the environmental concerns of the farming community, but we are aware that business owners have another point of view.