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.