Answer:
B comparable houses
Explanation:
In the real estate business, a "comp" is a comparable property or transaction. When estimating the value of a property, an agent will attempt to identify nearby properties that have comparable characteristics with respect to size, age, construction, state of mainenance, nearby amenities, and other factors that tend to affect the price.
Since the value of a property is only known by what someone is willing to pay for it, these comparable houses recently listed or sold are the "comps" used to form an estimate of the property value.