What must researchers ensure regarding selection criteria for participants?

Researchers must ensure that the criteria for selecting and excluding participants are fair, as this upholds the ethical principle of justice in research. Fair selection criteria help ensure that no specific group is unfairly burdened or excluded from the benefits of research, thereby fostering equality and preventing discrimination.

By adhering to fair criteria, researchers can create an inclusive study environment that respects the rights, dignity, and welfare of all potential participants. This is crucial for maintaining the integrity of the research process and for obtaining valid and generalizable results.

The other considerations, while important in their respective contexts, do not specifically address the fairness of selection criteria directly. For instance, eliminating all risks or providing compensation is valuable for ethical conduct, but it does not specifically pertain to how participants are chosen. Additionally, prioritizing high-profile participants could lead to bias and inequity, contradicting the need for fairness in participant selection.