What factors influence blood alcohol content (BAC)?

The correct answer identifies key factors that significantly impact an individual's blood alcohol content (BAC). Weight is a crucial factor because a person's body mass affects how alcohol is distributed throughout their system. Generally, individuals with lower body weight will have a higher BAC when consuming the same amount of alcohol as heavier individuals.

The amount consumed directly relates to BAC levels; as a person drinks more alcohol, their BAC will rise accordingly. This relationship is straightforward: the more alcohol in the bloodstream, the higher the BAC.

The time since drinking is also important because the body metabolizes alcohol over time. Knowing how long it has been since drinking began can help determine the current BAC level, as it decreases at a relatively steady rate as the liver processes the alcohol.

While the other options contain some accurate points, they do not fully encompass the most impactful influences on BAC. For example, age and hydration level can play roles but are not as directly correlated with BAC as weight, amount consumed, and time since drinking. Thus, focusing on the three factors highlighted in the correct option gives a more precise understanding of how BAC is affected.