which of these factors may affect a persons blood alcohol concentration?\n gender\n race\n blood type\n age

Brief Explanations:

Gender can affect blood - alcohol concentration because men and women generally have different body compositions and levels of enzymes that metabolize alcohol. For example, women typically have more body fat and less water than men of the same weight, which can lead to higher blood - alcohol concentrations when consuming the same amount of alcohol. Age can also play a role as the body's ability to metabolize alcohol changes with age. Older individuals may have reduced liver function and lower levels of enzymes involved in alcohol metabolism, resulting in higher blood - alcohol concentrations. Race and blood type do not directly impact how the body processes alcohol and thus do not affect blood - alcohol concentration.

Answer:

gender, age