The US Treasury Bond Is Considered to Be a "Risk-Free" Security

The U.S. Treasury bond is considered to be a "risk-free" security because the payment of principal and interest

A) will be adjusted for inflation.
B) will be adjusted for changes in the U.S. dollar's yield curve.
C) will be paid because the U.S. government has the ability to create money to repay bondholders.
D) all of the above are true.