The strict guidelines for U.S. companies when acquiring and using "conflicts minerals" from the Democratic Republic of Congo emphasize what essential lesson for managers? a O a. Culture plays little part in ethical behavior around the globe. b. Companies should avoid doing in any country prone to ethical lapses. O c. Business ethics should be local concern, not an international one. O d. Companies must identify, establish, and enforce ethical standards everywhere they do business O e Almost every country follows the same guidelines in conducting business