Why are futures contracts and options risky investments?

"(agricultural or mining products) or financial instruments (securities or currencies) at an agreed-on price at a future date. An investor can buy commodity futures contracts in cattle, pork bellies (large slabs of bacon), eggs, coffee, flour, gasoline, fuel oil, lumber, wheat, gold, and silver. Financial futures include Treasury securities and foreign currencies, such as the British pound or Japanese yen. Futures contracts do not pay interest or dividends. The return depends solely on favorable price changes. These are very risky investments because the prices can vary a great deal. Options are contracts that entitle holders to buy or sell specified quantities of common stocks or other financial instruments at a set price during a specified time. As with futures contracts, investors must correctly guess future price movements in the underlying financial instrument to earn a positive return. Unlike futures contracts, options do not legally obligate the holder to buy or sell, and the price paid for an option is the maximum amount that can be lost. However, options have very short maturities, so it is easy to quickly lose a lot of money with them."