[单选题]
The relationship betwh0zje/w.at 1 feen energy, E, and wavelength, λ, is show jglsbs /)0y4qn according to the eblgjs q0s4/)yquation below.
E=$\frac{hc}{λ}$
Which of the below statements are correct for the graph below representing E=$\frac{hc}{λ}$?
I.Energy and wavelength are directly proportional
II.The units for the gradient are J m$^{-1}$
III.The y-intercept has the units J
A. I and III only
B. II and III only
C. III only
D. I, II, and III
