Answer:
D) Legal environment
Step-by-step explanation:
-The Economic environment refers to the economic factors that can affect a business like inflation and interest rates.
-The technological environment refers to knowledge, techniques and tools available that can provide oportunities or threats for a company.
-The competitive environment refers to the external environment in which a company participates.
-Legal environment refers to the laws that the government establish to regulate the market.
According to this, the answer is that the environmental force that would have the most impact on Chenault's decision to issue cards through U.S. banks is the legal environment because the main problem is that banks that own Visa and MasterCard are not allowed to issue other types of credit cards and if the Supreme Court rule that Visa and MasterCard stifle competition and innovation, American Express might be able to issue its cards through U.S. banks.