It is C. Compound sentence. This is because it is far from simple, and even thought it might seem as a run on sentence, it is not, as run on sentences are sentences connected with a comma, yet this one is connected with a semi-colon, which is a correct way of connecting sentences.
A: a battery or alternator problem
I do not get what question you are trying to ask sorry.
What has been the greatest accomplishment that you have made?