Historical returns on investments in BONDS in the United States between $1930$ and $2020$ were about $5\%.$ During that same time period, returns on investments in STOCKS were about $10\%.$ Why was the return on stocks so much higher?

Because an investment in stocks is a lot more risky

Because an investment in bonds is an equity method activity

Because an investment in stocks is an available$-$for$-$sale activity

Because an investment in bonds is a lot more risky