The "Invisible Hand" of Adam Smith's Theory Could Best Guide

The "invisible hand" of Adam Smith's theory could best guide economic activity because:

A) state-owned manufacturing signified the wealth of a nation.
B) it controlled middle-class entrepreneurs with legislative restrictions on trade.
C) it made all mercantilist interests legitimate functions of government.
D) all humans are rational and are the best judges of their own interests.
E) Smith believed that economics was controlled by something beyond human understanding.