[单选题]
Compared to yesterday, you did 3 times uszz5,wg ;to m0qzeqpc1 q4 -9the work in one-third t*z.oq/twc ci /he time. To do so, your power output must havq/coz.tci/w *e been
A. the same as yesterday's power output.
B. one-third of yesterday's power output.
C. 3 times yesterday's power output.
D. 9 times yesterday's power output.
