Question

Select "Correct" if the sentence is punctuated correctly and "Run-on" if it is not.

Riding the express train is a pleasure, the cars are air-conditioned.

A) Correct
B) Run-on

I’ve asked this question before but I keep getting mixed answers:/

Answer 1

B run-on
It’s starting a new topic so it also needs to start a new sentence

Answer 2

A) Correct. I don’t see anything wrong with punctuation.