8. What letters of the English alphabet have reflectional symmetry (i.e., symmetry related to mirror reflection) about?
(a) a vertical mirror
(b) a horizontal mirror
(c) both horizontal and vertical mirrors
(a) a vertical mirror : A,H,I,M,O,T,U,V,W,X and Y
(b) horizontal mirror : B,C,D,E,H,I,O and X
(c) both horizontal and vertical mirrors : H,I,O and X.