Final answer:
A nurse identifying components of the epidemiologic triad would most likely include 'susceptible human beings' as they represent the host component of the triad, although 'high-risk groups of individuals' may also be considered as a specific host subgroup.
Step-by-step explanation:
The question posed asks which of the following a nurse would most likely identify as part of the epidemiologic triad: environmental pollution, radiation, susceptible human beings, or high-risk groups of individuals. The epidemiologic triad consists of three components: an external agent, a susceptible host, and an environment that brings the host and agent together. While all the options provided can be related to health issues, susceptible human beings (c) fit directly into the triad as the host component. High-risk groups of individuals (d) could also be considered as a specific subgroup of susceptible hosts. Environmental pollution and radiation (a and b) are examples of external agents or environmental factors that could contribute to disease but are not the sole focus of the triad without the inclusion of a host and an agent.