man/ sentence/ 15 years/ prison/ he prove/ guilty

A. The man will get a sentence for himself to 15 years in prison if he proves himself guilty.

B. The man was sentenced about 15 years in prison and proved himself guilty.

C. The man was sentenced to 15 years in prison because he had been proved guilty. 

D. The man should make his final sentence after 15 years in prison as he proved himself guilty.