Final answer:
The principle of justice
Step-by-step explanation:
The ethical principle that encompasses treating all clients with fairness and respect regardless of their situation is the principle of justice. The principle of justice emphasizes equitable or fair distribution and practice of healthcare. In clinical settings, it means treating patients in similar relevant circumstances equally and ensuring that similar cases are treated similarly. This principle also applies in research trials where all participants should be treated fairly and equally, without giving special treatment to some individually.