Which one is a run-on sentence? A. Insufficient funds prevented them from launching another costly missile. B. Mr. Smith thoroughly enjoys his solitary life in the country. C. I hear a sad tune it bothers me. D. If you soak seeds before planting, they will germinate faster.

Start by reading C

I hear a sad tune it bothers me. That sentence, though short, is still a run on.

You can fix it in a number of ways.

I hear a sad tune. It bothers me. I hear a sad tune and it bothers me. I hear a sad tune; it bothers me. It bothers me when I hear a sad tune.

The others are all OK.

c. i think, its the most like out of all the answers.