In a step-up transformer the turn ratio is 1: 10. A resistance of 200 ohm connected across the secondary is drawing a current of 0.5 amp. What is the primary voltage and current:

(A) 50 V, 1 amp
(B) 10 V, 5 amp
(C) 25 V, 4 amp
(D) 20 V, 2 amp