Which of the following statements describes a characteristic of Treasury securities?

Treasury securities are among the most liquid investments, as they are backed by the U.S. government and trade actively in large volumes.

A is correct because Treasuries are highly liquid, making them easy to buy and sell.

B is incorrect because most Treasury securities are not callable.

C is incorrect because FDIC insurance applies to bank deposits, not Treasuries.

D is incorrect because U.S. government securities have negligible default risk.