Which of the following factors does NOT affect Blood Alcohol Content (BAC)?

The factor that does not affect Blood Alcohol Content (BAC) is the time of day. BAC is primarily influenced by the amount of alcohol consumed, body weight, and food intake before or during drinking.

Body weight is relevant because individuals with a higher body weight generally have a larger volume of water in their bodies, which can dilute the alcohol and result in a lower BAC compared to someone of lighter weight who consumes the same amount of alcohol. The amount of alcohol consumed is crucial since more drinks lead to a higher BAC, and food intake can also impact BAC; eating before or while drinking slows the absorption of alcohol into the bloodstream.

Time of day, while it may influence conditions and behavior (such as fatigue or situational factors), does not have a direct effect on how alcohol is metabolized or the concentration of alcohol in the blood. Therefore, among the options presented, time of day stands out as the factor that is not linked to changes in BAC.