Which Level of Analysis in Psychology Is Correctly Matched with an Example

Which level of analysis in psychology is correctly matched with an example?

A) Brain level - At low doses, cocaine can improve performance on visual attention tasks, such as detecting specific stimuli appearing on a computer screen.
B) Individual level - Cocaine abuse is associated with a history of violence and sexual abuse in the family.
C) Brain level - Cocaine exerts its effects by prolonging the presence of specific chemicals at the junctions between nerve cells.
D) Group level - Cocaine abuse is associated with elevated levels of the personality trait of neuroticism and with low levels of the trait of conscientiousness.