Vertical Foreclosure Is an Example of a Firm

Vertical foreclosure is an example of a firm

A) raising its rivals' costs.
B) that merges with a rival firm with the intention of eliminating the rival firm's product from the market.
C) that controls an essential upstream input refusing to sell to other downstream firms that need the input.
D) raising its rivals' costs and that controls an essential upstream input refusing to sell to other downstream firms that need the input.