Which best describes how factors such as natural resources, physical characteristics, and the relative location of North American nations may have helped prevent war between them?

A) North American nations are similar in climate. Nations with similar climates are more likely to develop similar cultures. Nations with similar cultures are less likely to go to war.

B) The three North American nations share borders and have different natural resources, making trade more likely. Nations that trade with each other are less likely to go to war.

C) Most nations in North America lack valuable natural resources. Nations without natural resources are less likely to be invaded by other countries.

D) There are large physical barriers between the nations of North America. Nations with such features between them are less likely to go to war because invasions are difficult.