Final answer:
The "positive phase" of drinking, typically characterized by feelings of euphoria and increased self-confidence, occurs at a BAC of 0.05% (a). It is crucial to recognize the potential risks and harms associated with any level of alcohol use.
Step-by-step explanation:
The "positive phase" of drinking refers to the stage where individuals may experience feelings of euphoria and increased self-confidence. This phase typically occurs at lower BAC levels, before the negative effects of alcohol become more prominent. According to the information provided, the "positive phase" occurs at a BAC of 0.05% (a). As BAC levels increase beyond this point, the detrimental effects, such as impaired judgment and motor skills, become more significant. It's important to note that while a BAC of 0.05% may associate with some positive feelings, any level of alcohol consumption can impair your ability to perform tasks that require concentration and coordination, and the concept of a "positive phase" can be misleading because it ignores the potential risks and harms associated with alcohol use.