To make the country more desirable to foreign companies, china

allowed corporations to govern certain regions.
established different government structures in some regions.
invited foreign governments to oversee some regions.
removed communist party control over business in some areas.

the correct answer is D) removed Communist Party control over business in some areas.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

it would be that mali has the worst literacy rate than the others