A loss free transformer has `500` turns on its primary winding and `2500` in secondary. The meters of the secondary indicate `200` volts at `8` amperes under these condition. The voltage and current in the primary is
A. `100 V, 16 A`
B. `40 V, 40 A`
C. `160 V, 10A`
D. `80 V, 20 A`
