Question

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

Explanation:

Gender can affect blood alcohol concentration. Generally, women have less body water and less of the enzyme alcohol dehydrogenase (which breaks down alcohol) compared to men. So, for the same amount of alcohol consumed, women tend to have a higher blood alcohol concentration. Race and blood type do not have a direct impact on blood alcohol concentration. Age can also play a role as the body's ability to metabolize alcohol may change with age (e.g., older adults may metabolize alcohol more slowly in some cases).

Answer:

gender, age