According to the fifth paragraph, what does "comparative advantage" mean？A．It means that s

According to the fifth paragraph, what does "comparative advantage" mean？

A．It means that some countries have more favourable conditions for economic development than other countries.

B．It means that some countries can produce certain products at lower cost than other countries, thus it would be cheaper for other countries to import those products instead of manufacturing them by themselves.

C．It means that those countries which do not have favourable conditions for trading would better stop exporting and importing all they need.

D．It means that some countries can provide goods with better quality than other countries.