What does the sentence 'In today's complex economic world, neither individual nor nations are self-sufficient' mean?
A.
It means that today's world is a complex one, so all people and nations are able to provide all they want.
B.
It means that in today's complex economic world, people have developed different skills so all natioas and individuals need each other.
C.
It means that nations have utilised its own resources.
D.
It means countries that are lack of resources at home must buy from countries that export them.