From the Following List of Observations,choose the One That Most

Multiple Choice

From the following list of observations,choose the one that most clearly supports the following conclusion:
a) emission spectrum of hydrogen
b) the photoelectric effect
c) scattering of alpha particles by metal foil
d) diffraction
e) cathode "rays"
-Electromagnetic radiation has wave characteristics.

A) observation a
B) observation b
C) observation c
D) observation d
E) observation e