Read the sentences below. determine if the sentences are written correctly or if there is a fragment or run-on sentence.
i know the classics are important, i read mostly modern novels, i think modern literature is
more interesting.
a. fragment
b. run-on
c. correct

"I know the classics are important, I read mostly modern novels, I think modern literature is more interesting" would be a run-on sentence, since this sentence is really dealing with three separate ideas (separated by the commas) that should be separated into different sentences.