What Explains the Higher Standard of Living Rose for All

What explains the higher standard of living rose for all property-owning Americans in the colonies in the eighteenth century?

A) Overseas demand for American exports never slowed during the course of the century.
B) The passage of tax reform legislation by Parliament gave the American colonists more spendable income.
C) Instead of buying expensive British imports, the colonists bought less expensive goods manufactured and crafted in the colonies.
D) The price of British manufactured goods fell relative to the incomes of Americans.