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The property which is not of an electromagnetic wave travelling in free space is that;
A
they travel with a speed equal to $\frac{1}{\sqrt{\mu_0 \epsilon_0}}$
B
they originate from charges moving with uniform speed.
C
they are transverse in nature.
D
their energy density in electric field is equal to energy density in magnetic field.
Detailed Solution
Electromagnetic waves are produced by accelerating charges, not by charges moving with uniform speed (a charge moving with constant velocity does not radiate).
The other properties – speed $\frac{1}{\sqrt{\mu_0\varepsilon_0}}$, transverse nature and equal energy densities in the electric and magnetic fields – are all true for EM waves in free space.
So 'they originate from charges moving with uniform speed' is not a property of EM waves.