The measure of each exterior angle of a regular octagon is

The correct option is C. ${45}^{\circ }$

Number of sides in regular octagon, $n=8$

Since, measure of each exterior angle $=\frac{{360}^{\circ }}{n}$

$=\frac{{360}^{\circ }}{8}$

$={45}^{\circ }$

Hence, the measure of each exterior angle of a regular octagon is ${45}^{\circ }$.