Which of the Following Contributed to the Lowering of Barriers

Multiple Choice

Which of the following contributed to the lowering of barriers caused by distance and cultural differences?

A) The imposition of government-enforced tariffs on imports
B) The development of communication and transportation technology
C) The rejection of the free-trade doctrine
D) The imposition of government-enforced tariffs on exports
E) The restrictions placed on the flow of capital between nations