Final answer:
An "S8" classification indicates that the drug is a controlled substance with a high potential for abuse, and thus, it is strictly regulated and can only be prescribed by healthcare professionals.
Step-by-step explanation:
When a new drug is labeled as "S8," it refers to its classification as a controlled substance. The correct option for the meaning of an "S8" classification is C) It is a controlled substance with a high potential for abuse. This indicates that the substance is subject to strict regulation due to the risk of addiction and misuse. Such drugs require specific handling, prescribing, and storage guidelines to mitigate these risks. As such, S8 drugs are not available over the counter and must be prescribed by a qualified healthcare professional.