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

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