Michael Porter Proposed That Business-Level Strategies Originate with the Primary

Michael Porter proposed that business-level strategies originate with the primary competitive forces in the firm's environment;these forces are _____.

A) threats of new entrants and bargaining power of buyers and suppliers
B) threats of substitute products and services and competitive rivalries
C) threats of new entrants and substitute products or services,bargaining power of suppliers and buyers,and competitive rivalries
D) threats of government paperwork and tax increases,bargaining power of suppliers,and competitive rivalries
E) bargaining power of suppliers