[单选题]
The primary of a transformer has 1e8ri7x h 3gpw000 turns anup-be5i 3* vvdd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional *i5uvp-dv3 eb losses)
A. 50 W.
B. 100 W.
C. 200 W.
D. none of the given answers
