The phrase "subtitle options" refers to the different choices or settings available for displaying written translations of spoken dialogue on a video or movie. Full definition
The mono audio sounds OK, with English subtitles an option for Yanks. (screenandstream.com)
The variety of subtitle options available in the game will be a great help to disabled gamers with hearing impairments and colorblind players won't need help identifying objects in Before The Storm. (dagersystem.com)
It's worth noting that the U.S. DVD of the film featured additional audio and subtitle options in Spanish. (thedigitalbits.com)