If a stock has a beta value greater than $1,$ it means that:

$($a$)$ the stock return is more volatile than that of the market portfolio.

$($b$)$ an investor can eliminate the risk by combining it with another stock that has a negative beta.

$($c$)$ an investor will earn a higher return on his stock than that of the market portfolio.

$($d$)$ an investor will earn a higher return on his stock than on the market portfolio.

$($e$)$ None of the above