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

Alevy taxes.
Bprint and coin money.
Cborrow money.
Dregulate commerce.

Verified Answer :

When you buy a U.S. government savings bond, you're doing so under the power given to Congress to "C. borrow money", since you're essentially lending your money to the government for a set period of time.