The Unit Implemented a Quality Improvement Program to Address Client

The unit implemented a quality improvement program to address client pain relief.  Which set of criteria is the best determinant that the goal has been met?

A) Chart audits found clients' self-reported pain scores improved by 10%
B) Number of narcotics used on the unit increased by 20%
C) Positive comments on returned client satisfaction surveys increased by 30%
D) Survey found that 90% of the nurses believed clients had better pain control