Which of the following statements is the most accurate definition of efficiency?

A) A measure of a specific intervention, procedure, regimen, or service produces a beneficial result under ideal conditions.
B) The process of testing a vaccine in a community where some of individuals do not want to be vaccinated.
C) The process of testing a new drug in a community where individuals have various compliances of drug intake.
D) The process of estimating the best effort of intervention or procedure.
E) The effects or end results achieved in relation to the effort expended in terms of money, resources, and time.

Efficiency is more like a measure or comparison of effects of agents related to the money,emotions,pain,time,absenteeism,social stigma,and disability."A measure of a specific intervention,procedure,regimen,or service produces a beneficial result under ideal conditions" and "The process of estimating the best effort of intervention or procedure" are not correct.Those indicate efficacy."The process of testing a vaccine in a community where some of individuals do not want to be vaccinated" and "The process of testing a new drug in a community where individuals have various compliances of drug intake" are not correct.Those indicate effectiveness.