Final answer:
A history of aggression coupled with alcohol consumption, such as a recent assault on a drinking companion, is the most reliable predictor of future violence in a newly admitted client.
Step-by-step explanation:
The best predictor of violence in a newly admitted client is likely A. Recent assault on a drinking companion. Studies, like those by Greenberg & Barling (1999), have shown that a history of aggression and the amount of alcohol consumed can be accurate predictors of future violence. This is consistent with findings that drug and alcohol use are significant contributors to interpersonal violence (IPV) and child abuse. Additionally, a pattern of such behavior indicates a higher likelihood for repeated violence compared to a family history of bipolar disorder, a nurse's subjective feelings, or a history of being bullied.