Only a Few Firms in the Textile Industry of United

Only a few firms in the textile industry of United Malva,a developing country,have adopted the practice of relating organizational rewards to employee performance.All of the following reasons can be attributed to the limited use of performance-reward practice EXCEPT:

A) union contracts often require that rewards be based on totally objective variables.
B) such practices lack evidence of practical benefits to companies.
C) discipline is required to facilitate such practices.
D) such practices require that performance be accurately measured, and this is not easily accomplished.