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The three major factors in determining blood alcohol concentration (BAC) are indeed the amount of alcohol consumed, how fast it is consumed, and body weight. The amount of alcohol consumed directly influences BAC; more alcohol in the bloodstream leads to a higher BAC. The rate at which alcohol is consumed also plays a crucial role; consuming drinks rapidly can increase BAC more quickly than sipping on them over a longer period. Body weight is a significant factor because individuals with a lower body weight will generally experience a higher BAC than those with a higher body weight after consuming the same amount of alcohol, due to a smaller volume of blood to distribute the alcohol. Other options include factors that can influence intoxication or perception of drinking effects, but they don't directly relate to the calculation of BAC. For instance, food can indeed slow the absorption of alcohol, but it isn't a primary factor in the calculation of BAC itself. Similarly, the type of alcohol and drinking environment may influence personal experiences but do not directly correlate with a measurable BAC level.