They said, "It was raining heavily,when they came out of the theatre."

• A. hey said that it was raining heavily, when they had come out of the theatre.
• B. hey said that it had been raining heavily, when they came out of the theatre.
• C. hey said that it rained when they had come out of the theatre.
• D. hey said that it had been raining heavily, when they had come out of the theatre.