c$)$ Annual returns on the more than $5000$ common stocks available to investors vary a lot. In a recent year, the mean return was $8\mathrm{.}3\%$ and the standard deviation of return was $28\mathrm{.}5\%.$ The law of large numbers says that

A$.$ if you invest in a large number of stocks chosen at random, your average return will have approximately a Normal distribution.

B$.$ as you invest in more and more stocks chosen at random that year, your average return on these stocks gets ever closer to $8\mathrm{.}3\%.$

C$.$ you can get an average return higher than the mean $8\mathrm{.}3\%$ by investing in a large number of stocks.

D$.$ None of the above.