Which of the Following Best Captures the Difference Between Efficiency

Which of the following best captures the difference between efficiency and effectiveness?

A) Efficiency means doing what the company's engineers want,while effectiveness means doing what consumers want.
B) Efficiency means maximizing output,while effectiveness means maximizing profit.
C) Efficiency means doing things right,while effectiveness means doing the right things.
D) Efficiency means doing what production wants,while effectiveness means doing what the marketing department wants.
E) Efficiency means working as fast as possible,while effectiveness means working smart.