In Which Situation Are Transaction Costs Most Likely to Be

In which situation are transaction costs most likely to be the lowest?

A) Rodney buys antiques; he is currently looking for an eighteenth-century table.
B) Cathy is looking for someone who is willing to trade accounting services (in return) for law services.
C) Rodriguez wants to buy a house with two master bedrooms.
D) Melinda wants to buy a McDonald's Big Mac (she will not be asking for a special order) .