Answer: I agree to the statements
Explanation: Buyer power also called Buyer Bargaining Power is the ability of a consumer to exert pressure on the service to get it to deliver quality products, lower costs and better customer service.
Company B having alternatives can be used to its advantage to threaten company A to do its abiding or he is forced to move to the alternative. Just as in the case of Cork and Seal, they had more than 1 supplier.
Cost leadership is a strategy in which a company's products are the most lowly priced products making it better position to compete effectively.
Source of strategy for cost leadership may be available to competitors but they may not be willing to go down that line for fear of the unknown. Toyota for instance drive its cost lower by investing in efficient scale facilities, overhead control and minimization of cost.