[单选题]
Plane mirrors produc56cawyf0byx pq2jo7-+nv 6bc e imagesj(myenf,6d d,8cdg;q which
A. are always smaller than the actual object.
B. are always larger than the actual object.
C. are always the same size as the actual object.
D. could be smaller, larger, or the same size as the actual object, depending on the placement of the object.