Which of the following mutations is most likely to result in a heritable change? A. ULTRAVIOLET LIGHT FROM THE SUN CAUSES A MUTATION AND A SKIN CELL.

B. RADIATION FROM X-RAYS CAUSES A MUTATION IN BRAIN CELL.

C. A CHEMICAL AND CIGARETTE SMOKE CAUSES A MUTATION IN A LUNG CELL.

D. A SUBSTITUTION IN DNA CODING CAUSES A MUTATION IN A SPERM CELL.

I THINK ITS D. BUT CAN SOMEONE HELP ME