This question is testing whether you know the wide range of things computers are used for today, rather than a single narrow technical fact.
Computers are routinely used for entertainment (games, streaming video and music), for accessing and processing information (research, storing records, calculations), and for social media (connecting with people, sharing posts and messages online). Since every one of these listed activities is, in fact, something computers are commonly used for, there is no option among them that correctly names something computers are not used for.
Because entertainment, information, and social media are all genuine, everyday uses of a computer, the only option consistent with the facts is the one that rejects all three as the exception being asked for.
Exam tip: on "which is NOT" questions, always check whether every listed item actually fits the category before picking one, if they all fit, the correct choice is the one that says none of them is the exception.