Patty O'Rourke Hired an Attorney to Represent Her in a Court

Patty O'Rourke hired an attorney to represent her in a court case involving an auto accident.The attorney charged O'Rourke a fee for his services.Terry Thomas needed a haircut--the local stylist charged him $12 for her services.Aaron Mathison mowed his neighbor's lawn; in exchange, the neighbor roto-tilled Mathison's garden.The attorney fees paid by O'Rourke, the $12 charged by the hair stylist, and exchange of lawn mowing for garden tilling are examples of

A) price.
B) barter.
C) fee setting.
D) unfair market exchanges.
E) product fares.