One of the concerns of multinational corporations is whether North American. management practices and theories are appropriate for use in foreign countries. Hofstede's research in this area indicates that North American theories $\_\_\_\_\_\_\_\_.$

A$.$ work best within American$-$based multinational corporations

B$.$ are universally applicable since they are good theories

C work best within English$-$speaking countries

D$.$are only valid within the United States

E$.$are still ethnocentric