[单选题]
The angle of inciden j,-+r1piov v d6n4brqcdq23ijmkgigg rbdfqkj84: oz* )/e-; e
A. must equal the angle of reflection.
B. is always less than the angle of reflection.
C. is always greater than the angle of reflection.
D. may be greater than, less than, or equal to the angle of reflection.