The boy lost several of his fingers because of firecrackers. The doctors are operating on him.

A. The boy who lost several of his fingers because of firecrackers is being operating on.

B. The boy whom the doctors are operating on him lost several of his fingers because of firecrackers.

C. The boy was whom the doctors are operating on him lost several of his fingers because of firecrackers.

D. The doctors are operating on the boy who lost several of his fingers because of firecrackers.