Question

Which sentence is a run-on sentence? A. Trading cards are easy to store, and they are easy to transport. B. Collecting trading cards is enjoyable, though I prefer coin collecting. C. I collect old coins; my brother collects trading cards. D. Collecting is very popular today, it is a good investment and fun.
PLZ HELP ASAP

Answer 1

The correct answer is D. Collecting is very popular today, it is a good investment and fun.

This is because these two sentences are connected only using a comma. What it needs is a conjunction to avoid being a run-on sentence. The other sentences have either conjunctions or a semi colon which also works.