What does the law of reflection state when the ray of light reflects off a surface ?

Question

$\begin{array}{1 1} (a)\;\angle{i} = \angle{r} \\ (b)\; \angle{i} < \angle{r} \\ (c)\;\angle{i} > \angle{r} \\ (d)\; \angle{i} \neq \angle{r}\end{array}$