Adam Smith, author of The Wealth of Nations, asserted that a laissez-faire economic policy was best. What was Smith's other, related, assertion?

a. Slavery is justified, because it is inexpensive labor.
b. Importation of raw goods back to England should be prohibited.
c. The emerging tobacco industry was exhausting the soil.
d. Independence from England would cause catastrophic effects on the stability of the colonies.

Answer: a