Typically (historically) over the long term (not considering different risk levels) which has generated the greatest gains?

a.U.S. Treasury Bonds, Bills, and Notes have outperformed other financial investments

b.Investments in socks (equities/stocks/ETFs listed in the stock exchange) have outperformed other financial investments

c.Putting cash under the pillow at home

d.Deposits in a bank have outperformed other financial investments