Final answer:
The phase of risk assessment that involves the qualitative identification of contaminants is Risk Identification.
Step-by-step explanation:
In a risk assessment, the phase that involves the qualitative identification of contaminants is Risk Identification (D). During this phase, potential sources of risk are recognized, and this may include the identification of chemical, biological, and physical agents that could possibly cause harm to humans, wildlife, or the environment. This initial step sets the stage for a subsequent analysis of the risk associated with these identified contaminants.