Maxwell's Great Contribution to Electromagnetic Theory Was His Hypothesis That $\mu$

Multiple Choice

Maxwell's great contribution to electromagnetic theory was his hypothesis that:

A) work is required to move a magnetic pole through a closed path surrounding a current
B) a time-varying electric flux acts as a current for purposes of producing a magnetic field
C) the speed of light could be determined from simple electrostatic and magnetostatic experiments (finding the values of $\mu$ ₀ and )
D) the magnetic force on a moving charge particle is perpendicular to both
E) magnetism could be explained in terms of circulating currents in atoms