Two things happen to the flag of A in B. Do the same two things to the flag in C.

In B the flag is the mirror image of A in an upright mirror (the cloth moves from the right of the pole to the left) and it has turned from orange to blue. The flag in C lies flat with the pole along the bottom and the cloth below it on the right; its mirror image lies the other way, with the pole pointing left and the cloth still below it, and it must be blue: (c). (a) is a half turn, which puts the cloth on top, (b) stays orange and (d) is not reflected.