Because investors are rational, more-risky investments tend to offer higher expected returns than less-risky ones. Which of the following orderings of increasing risk is most accurate?

A. US T-Bills, Long-Term Bonds, Gold, Options, Stocks, Real Estate

B. Gold, US T-Bills, Long-Term Bonds, Stocks, Options, Real Estate

C. US T-Bills, Long-Term Bonds, Real Estate, Stocks, Gold, Options,

D. US T-Bills, Long-Term Bonds, Stocks, Real Estate, Options, Gold