The best option to answer the question is (C) she can use bright, contrasting colors and place a link to the index of summer clothing product pages in a noticeable location.
The other options are not the best avenue of action to take since she using black and white colors might not be the best way to attract the young adults who are looking for summer clothing – she should choose bright colors instead.
Writing a detailed article might be a good way to market her products if she links her clothing in the article, but since the option doesn’t mention her doing that, we should choose option (C) instead, since it directly states putting links that direct her visitors to summer clothing that her website offers.