Question

When you buy a U.S. government savings bond, you're doing so under the power given to Congress to

A. regulate commerce.
  B. borrow money.
  C. print and coin money.
  D. levy taxes.

Answer 1

B. borrow money

Step-by-step explanation:

The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States; but all Duties, Imposts and Excises shall be uniform throughout the United States;

To borrow Money on the credit of the United States

Answer 2

B. Borrow money because by definition, you lend money to an entity when you buy a bond from it. You give the entity the power to borrow. The U.S. government has the power to regulate commerce, levy taxes, print and coin money regardless of bond issurance. Buying bonds does not increase the power.
Hope this helps