You have selected Buying, Product (in reference to you as the user) and now you need to select B2B (Business to Business), or B2C (Business to Consumer), or W2B (Wholesale to Business):

B2B Example of Products with various options would be:

Signs, Furniture, Shutters purchased by contractor, Metal Buildings

B2C Example of Products with various options would be:

Printing of Personal items, Shutters for home owners, Bikes

Products without option: 52" Plasma High Definition TV

W2B Example of Products with various options would be:

Sign Shop buying Large Pan Face sign enclosures & the words of the customer name, Custom Cabinet Shop