The ratio of output to input gives a measure of?

my answer is B. effectiveness, output/output is always an efficiency indication

Thanks for invitation ..................... my answer is C

thank you for invitation

answer

C.productivity

Thanks for the invitation. My answer is C

C - Productivity is the right answer 

I THINK OPTION C IS THE RIGHT ANSWER

think you for invitation 

i think the answer E. quality control   

the ratio of output to inputs used in the production process

C.    productivity

The ratio of output : input = productivity

Answer is C. Thanks.................

 productivity  IS