Answer:
B. a biopsychosocial approach is the correct answer.
Step-by-step explanation:
A biopsychosocial approach is a tool used by psychologists to know how psychological disorders occur.
The biopsychosocial approach examines the psychological factors, social factors, biological factors of how they are affecting and influences the people's health and what is the reason for disorders.
Thus the correct option is the biopsychosocial approach as it examines the factors and their interaction in knowing the diseases and health.