The microstrip transmission line illustrated below cannot su

The microstrip transmission line, illustrated below, cannot support a pure transverse electromagnetic wave because the phase velocity of the field in air is 3 times 10^8 m/s but the phase velocity of the field in the substrate is 3 times 10^8/epsilon_f^1/2, m/s which leads to an intermediate effective dielectric constant.

Solution

Yes, the question is details are correct

so option A is correct