As a Country Develops Economically, What Changes Usually Take Place

As a country develops economically, what changes usually take place in the goods it exports?

A) There is little change because comparative advantage does not change.
B) Raw materials and agricultural products decline in importance and are replaced by services and manufactured goods.
C) Services and manufactured goods decline in importance and are replaced by raw materials and agricultural products.
D) Exports go from being diversified to being specialized in whatever the country finds to be its comparative advantage.