Many People Would Like to Sell and Buy on EBay

Many people would like to sell and buy on eBay but are unsure how much to charge or pay. A company called Keen.com has set up a directory of specialists to whom you can address questions. Keen.com charges a per-minute fee to the person who contacts its specialist. How would Keen.com be classified?

A) as a tangible resource
B) as a tangible product
C) as a service
D) as a nonprofit organization