[单选题]
Which of the followi26 tgf/cln et1ng is a fa/..tzl1tpw ruhi01g r5j mg(jw8e 1ts lse statement?
A. All points on a given wave front have the same phase.
B. Rays are always perpendicular to wave fronts.
C. All wave fronts have the same amplitude.
D. The spacing between adjacent wave fronts is one-half wavelength.
