Choose the sentence that punctuates this run on sentence correctly: I was late for my appointment so I accidentally ran a red light.

A.) I was late for my appointment, so, I accidentally ran a red light.

B.) I was late for my appointment; so I accidentally ran a red light.

C.) I was late for my appointment, so I accidentally ran a red light.

D.) I was late for my appointment so, I accidentally ran a red light.