What is a characteristic of a law deemed 'vague'?

A law that is considered 'vague' lacks the clarity and precision required for individuals to understand what conduct is prohibited or required. This ambiguity can lead to arbitrary enforcement, where law enforcement officials or courts may apply the law inconsistently or subjectively, depending on their interpretation. The principle behind this is that individuals must be able to understand the law in order to comply with it; if it's too vague, it becomes difficult to know what behavior is acceptable, potentially violating the principle of legality.

Clear standards and fair notice of prohibitions are fundamental characteristics of legally enforceable laws. When laws are vague, they fail to provide such clarity and notice, which is why option C accurately describes the problem associated with vague laws. It highlights how vagueness contributes to potential injustice and inconsistency in law enforcement.