Which of the following is not transported by electromagnetic waves?

The correct statement among the following is:

The relation between the permittivity of free space $(\epsilon_0)$, the permeability of free space $(\mu_0)$, and the speed of light $(c)$ is:

The speed of electromagnetic waves in a medium is $1.5 \times 10^8 \ m/s$. If the relative permittivity of that medium is $2$,then its magnetic susceptibility is (speed of light in vacuum is $3 \times 10^8 \ m/s$).

$A$ plane electromagnetic wave of frequency $25 \; MHz$ travels in free space along the $x$-direction. At a particular point in space and time,$\vec{E} = 6.3 \hat{j} \; V/m$. What is $\vec{B}$ at this point?

What are electromagnetic waves?