Which of the sentences contains both an independent and a dependent clause?
A. He was listening intently to the radio, and he did not 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.
