Cal's Market has a return on equity $($ROE$)$ of $15$ percent. What does this mean?

Multiple choice question.

Cal's paid a dividend of $$\mathrm{.}15$ per share to its shareholders this year.

Cal's generated $$\mathrm{.}15$ in profit for every $$1$ of sales.

Cal's generated $$\mathrm{.}15$ in profit for every $$1$ of book value of equity.

Cal's generated $$\mathrm{.}15$ in profit for every $$1$ of market value of equity.