Final answer:
A common law would most likely be invoked in a case where a nurse touches a client without their consent, relying on prior judicial decisions and the flexibility of case law to interpret the situation (option B).
Step-by-step explanation:
An accurate description of a common law in the context of the question provided is: B. A common law would be invoked to deal with a nurse who touches a client without the client's consent. The principles of common law, which is a law developed by judges through decisions of courts, play a significant role here.
If a nurse touches a patient without their consent, it could lead to a common law tort of battery. Since common law is case-based, previous judicial decisions regarding similar incidents would determine the standard of care and inform whether the nurse's actions were unlawful. On the other hand, options A, C, and D might not necessarily rely on common law.