How does the modern money of the United States differ from money used in the past?

The U.S. dollar has intrinsic value and is redeemable for a commodity of value.
The U.S. dollar has no intrinsic value and is not redeemable for a commodity of value.
The U.S. dollar has intrinsic value but is not redeemable for a commodity of value.
The U.S. dollar has no intrinsic value but is redeemable for a commodity of value.

The correct answer is: The U.S. dollar has no intrinsic value and is not redeemable for a commodity of value. Unlike in the past, the U.S. dollar is no longer backed by a commodity such as gold and is considered a fiat currency. Its value is determined by the government and the market, rather than being tied to a physical commodity.