AMC 12A 2020 Problem 14

Regular octagon A B C D E F G H has area n. Let m be the area of quadrilateral A C E G. What is \dfrac{m}{n} ?

Answer Choices
A. \dfrac{\sqrt{2}}{4}
B. \dfrac{\sqrt{2}}{2}
C. \dfrac{3}{4}
D. \dfrac{3 \sqrt{2}}{5}
E. \dfrac{2 \sqrt{2}}{3}