If Big Sails and Jet Sails Are Two Competing Sailboat

Multiple Choice

If Big Sails and Jet Sails are two competing sailboat firms and Big Sails wants to make a threat to Jet Sails more credible, they can do all of the following except which one?

A) take action to lower the firm's costs
B) keep Jet Sails in the dark regrading Big Sails' plans
C) take action to increase the firm's capacity
D) make Jet Sails aware of Big Sails' plans