What charge can John face if he spikes the punch with liquor at a class party?

The correct answer is the unlawful administering of liquors. This charge is pertinent because when someone adds alcohol to a drink without the knowledge or consent of the others consuming it, it constitutes an illegal act. This action can put individuals at risk, especially if they are underage or unable to consent to the consumption of alcohol.

In many jurisdictions, spiking drinks can also expose the perpetrator to additional liabilities, including potential harm or impairment that results from the unconsented consumption of alcoholic beverages. This behavior is often treated seriously by the law due to the implications for the health and safety of those affected.

The other options do not align with the specific legal implications of adding alcohol to a beverage without consent. While assault and criminal damage could be associated with different behaviors at a party, such as causing physical harm or vandalism respectively, they do not directly apply to the act of spiking a drink. The idea that nothing would happen is misleading, as there are consequences for such actions, which is why the unlawful administering of liquors is the most fitting charge in this scenario.