When testing whether we can achieve a less expensive and better way to treat a disease with an intervention that has shown to work previously,we are looking for

A) efficacy.
B) effectiveness.
C) efficiency.
D) power.
E) feasibility.

Efficiency

The ability to accomplish a task with the least waste of time and effort.

Effectiveness

The degree to which a procedure, when used under usual or everyday conditions, achieves the intended effect or results, distinguishing it from efficacy, which is measured under idealized conditions.

Efficacy

The ability to produce a desired or intended result.