Question

Which sentence correctly forms the plural of the letters URL?

A.
Use this list of URL's to do research for your report.

B.
Use this list of URLs' to do research for your report.

C.
Use this list of URLs to do research for your report.

Answer 1

The correct answer to the question stated above is obviously letter C. Use this list of URLs to do research for your report.

URL's and  URLs' in sentence A and B respectively, are not used properly too. Both mentioned URLs is expressing possession because of  apostrophe s and s apostrophe ('s and s' ).