Can Sales Agents, Such as Realtors, Generate Economic Surplus

Multiple Choice

Can sales agents, such as realtors, generate economic surplus?

A) No, because the value of a product is based purely on the cost of producing it and not on who buys it.
B) No, because sales agents don't produce anything new.
C) Yes, but only if they work for free, otherwise they are a waste of resources.
D) Yes, because they help ensure that goods are purchased by consumers who value them the most highly.