Answer:
Option: A is the correct answer.
A. 45°,135°
Explanation:
We know that for a regular polygon with n sides the measure of each of the exterior angle is given by:

Also, the measure of each of the interior angles of the regular polygon with n sides is given by:

Here we have n=8 (octagon)
Hence, the measure of each of the exterior angles is:

and measure of each of the interior angles is given by:

Hence,
Measure of interior angle= 135°
and measure of exterior angle= 45°