The Effectiveness of Any of the Generic Business-Level Strategies Is

The effectiveness of any of the generic business-level strategies is contingent on both:

A) customer needs and competitors' strategies.
B) the opportunities and threats in a firm's external environment and the strengths and weaknesses derived from the firm's resource portfolio.
C) the trends in the general consumer base and the robustness of the global and industry economy.
D) the firm's competitive scope and its competitive advantage.