Which Course of Action Most Improves the Following Sentence? "Don't

Which course of action most improves the following sentence? "Don't forget to change your car's oil every 3000 miles, you risk damaging the engine if you drive without enough oil."

A) Fix the parallel structure.
B) Change from second to third person.
C) Fix the comma splice.
D) Set off the parenthetical remark with commas.