I usually take my dog out for a walk when I come home from work , he said.

• A. He said that he used to take his dog out for a walk when he came home from work.
• B. He said that he usually took his dog out for a walk when he had come home from work.
• C. He said that he usually takes his dog out for a work when he comes home from work.
• D. He said that he usually took his dog out for a walk when he came home from work.