Concept:Drug abuse directly affects the brain and emotions, often leading to psychological disorders such as depression.
Explanation:Drug abuse alters the normal balance of chemicals in the brain.
This change can cause persistent sadness, hopelessness, and loss of interest in daily activities.
These symptoms are classic signs of depression, which is a well-known consequence of drug abuse.
Depression may also increase the risk of self-harm and physical illness.
While inefficiency, cowardice, and victimization may occur in some situations, they are not as direct or universal as depression.
Thus, among the given options, depression is the most appropriate consequence of drug abuse.
Answer:A. depression