The transformer relation $\dfrac{V_s}{V_p}=\dfrac{N_s}{N_p}$ is derived assuming a sinusoidal (AC) source, where both primary and secondary voltages are the induced EMFs from a common alternating flux. That derivation breaks down for DC.
With a 220 V DC supply, once the transient dies out the primary current is steady, so the core flux settles to a constant value. A constant flux has zero time derivative, and Faraday's law gives an induced secondary EMF of $V_s=-N_s\,d\Phi/dt=0$.
Therefore, plugging into the turns-ratio formula is invalid; the physically correct answer is that the steady-state secondary voltage is zero. (Only during the brief switch-on transient would a momentary spike appear.) This corresponds to option (D).
\[\boxed{V_s=0\,\text{V (DC)}}\]