Final answer:
The key criterion for a sample in a phenomenological study is that participants must be willing to share their lived experiences related to the phenomenon under investigation.
Step-by-step explanation:
The key criterion for being included in a sample for a phenomenological study is D. Participants must have a willingness to share their lived experiences related to the phenomenon. this is because phenomenological research aims to understand the essence of experiences concerning a particular phenomenon. By documenting and analyzing the subjective experiences of individuals who are willing to share them, researchers can gain insight into how people perceive and make sense of their experiences.
In contrast to other methods that may require random sampling or participants with specialized knowledge, phenomenological studies often rely on participants who have deeply experienced the phenomenon of interest and can provide rich, detailed accounts of it.