Before Michael Porter Developed the Diamond Model, He Studied Companies

Before Michael Porter developed the Diamond Model, he studied companies in more than 100 industries. While most successful companies differed in many ways and employed different strategies, a very important common theme that emerged was that

A) firms that have been extremely successful in marketing in the United States must duplicate the same strategy in foreign markets.
B) a company that succeeds on a global scale first succeeded in intense domestic competition.
C) marketing research is not important in foreign markets but extremely important in domestic markets.
D) marketing managers must organize the same controllable decision variables that exist in domestic markets in foreign markets with no changes whatsoever.