Which of these statements about citing information is true?

You do not have to cite sources when you paraphrase, because you are using your own words.
Information that is considered common knowledge should still be cited for those who might not know it.
You only need to cite sources when you use quotation marks.
A summary of an article should still be cited even if you aren't using all of the information.

Information that is considered common knowledge should still be cited for those who might not know it.

The statement "You only need to cite sources when you use quotation marks" is true.