Waves may be observed to reflect, refract, diffract, and interfere. Two of these behaviors are unique to waves only and two of them may also be observed for particles (or convincingly counterfeited by particles). Which two are wave behavior only?

Select one:
A. reflection and refraction
B. diffraction and reflection
C. reflection and interference
D. refraction and diffraction
E. interference and refraction
F. diffraction and interference