If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?

If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?

A. Vs/Vp = Np/Ns
B. Vs/Vp = Ns/Np
C. Vp/Vs = Ns/Np
D. Vp/Vs = Np/Ns