What Is a Reason That Countries Trade

Multiple Choice

What is a reason that countries trade?

A) A self-sufficient country can provide products and services to one that is not self-sufficient.
B) Some countries do not want to share their natural resources.
C) Some countries are proprietary about their technology products and keep them close to home.
D) Some countries can't produce all the products they need and must buy them elsewhere.
E) An oil rich country can charge whatever it wants to one that needs the oil and can't produce it.