The category list presents a wide variety of themes that will fit almost every campaign. You should choose the one that matches your campaign theme and not the target audience you would like to have.
Each campaign only has one main category, so don’t duplicate your campaign in order to choose more categories – it will be rejected.
For a campaign promoting young men’s clothes, you should choose the category “Apparel” and not “Games & Consoles”. The category represents what your campaign is all about and not who you want to target. If you want to target young adults, select the age range on the next menu.