Select the word that is spelled correctly

Define the why, where, how, and what of public health practice

The focus of a quality control program is to ____. 

A. protect the safety of employees in the workplace B. assume that all blood, blood products, human tissue, and body fluids are contaminated C. provide information about hazardous chemicals or other substances D. ensure accuracy in test results through careful monitoring of test procedures E. specify standards that must be met in order to perform laboratory tests in a POL