Maxwell's major contribution to EM theory was to assert

A. that an electric field varying with time in free space gives rise to a current

B. that a magnetic field varying with time gives rise to an electric field

C. that a magnetic field varying with space gives rise to an electric field

D. that energy density due to an electric field is $$\frac{1}{2}\varepsilon {{\text{E}}^2}$$

Answer: Option A