Final answer:
The "clean hands" principle is an example of the law of equity, which requires parties seeking equitable relief to be free from wrongdoing in the matter.
Step-by-step explanation:
An example of the law of equity is A) the "clean hands" principle. Equity is a branch of law that deals with ensuring fairness and justice in outcomes. The clean hands principle dictates that an individual seeking equitable relief must be free of wrongdoing in the matter at hand. The options B) "decidendi" principle, C) "stare decisis" doctrine, and D) "judicial discretion" principle are different legal concepts.
The "decidendi" relates to the rationale of previous court decisions, the "stare decisis" doctrine emphasizes the importance of precedent in legal decisions, and "judicial discretion" refers to a judge's ability to make decisions based on their judgment within certain bounds of the law.