[单选题]
In a transformer, the power inpife7.fgdjz385 9b; 6 fi*+ugcmimi(lq zuma ; u0-4- 0gkeqz3rzqnu l st
A. is larger than the power output.
B. is equal to the power output.
C. is smaller than the power output.
D. can be either larger or smaller than the power output.
