As Compared to Jack, Jill Does Twice the Work in Half

Multiple Choice

As compared to Jack, Jill does twice the work in half the time. Jill's power output is

A) the same as Jack's power output.
B) one-fourth as much as Jack's power output.
C) one-half as much as Jack's power output.
D) twice Jack's power output.
E) four times Jack's power output.