All of the Following Are Required to Make a Tying

Multiple Choice

All of the following are required to make a tying arrangement vulnerable to antitrust prosecution except which one?

A) The seller must have substantial market power in the market for the tying product.
B) There must be at least two products involved.
C) There cannot be proof of an actual tie between two products.
D) There must be proof of an actual tie between two products.