The process labeled A in the diagram is an example of: 
Definitions:
Concentrate
The act of focusing one's mental or physical effort on a particular task or activity, aiming to enhance efficiency or performance.
Substance Abuse
The harmful or hazardous use of psychoactive substances, including alcohol and illicit drugs, leading to addiction or other detrimental effects.
Misuse Of Prescription Drugs
The use of prescription medication in a manner not intended by the prescribing doctor, including using drugs in excessive amounts, for extended periods, or without a prescription.
Elderly
Pertaining to individuals who are significantly beyond the middle age, often considered to be 65 years and older.
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