Which of the following relates inputs to outputs?

a. productivity

b. economics

c. effectiveness

d. efficiency

A. Productivity

The inputs and outputs when it comes to business is a matter of getting things done to achieve a result. The process of productivity makes the most sense to me.

D

Explanation:

Efficiency is the concept in which minimum input are put to get maximum output. This is where firms tries to achieve efficiency.

Productivity is total output divided by total workers.

Effectiveness is all about making such products which satisfy consumer needs.

And economics is a study of wealth.

Therefore option D is right. Other options are not relevant.