well, to make it easier lets translate the words:
1. el disco compacto = the compact disc
2. la tienda de ropa = the clothing store
3. El libro = the book
4. la revista = magazine.
So, it looks like 3 out of 4 are items; which would be the el disco compacto, el libro, and la revista. Therefore, the clothing store, or la tienda de ropa is the one that does not belong.
