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

A) Testing a vaccine in a group of consenting individuals.
B) A measure of a specific intervention, procedure, regimen, or service produces a beneficial result under ideal conditions.
C) Testing a vaccine in a community where some of individuals do not want to be vaccinated.
D) The process of making the best use of scarce resources.
E) The effects or end results achieved in relation to the effort expended in terms of money, resources, and time.

Measuring the effect of intervention,procedures,regiment,or service in the real world is an example of effectiveness."Testing a vaccine in a group of consenting individuals" and "A measure of a specific intervention,procedure,regimen,or service produces a beneficial result under ideal conditions" are not correct.Those indicate efficacy."The process of making the best use of scarce resources" and "The effects or end results achieved in relation to the effort expended in terms of money,resources,and time" are not correct.Those indicate efficiency.