Question

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

Explanation:

Gender can affect blood - alcohol concentration because men and women generally have different body compositions and levels of enzymes involved in alcohol metabolism. For example, women typically have more body fat and less water than men of the same weight, and the enzyme alcohol dehydrogenase, which breaks down alcohol, is often present in lower amounts in women. Race, blood type, and age do not directly affect blood - alcohol concentration in the same significant way as gender does in terms of physiological processes related to alcohol metabolism.

Answer:

gender