What are currently the two largest areas of specialization in research-oriented psychology

A)  clinical and counselling psychology
B)  developmental and clinical psychology 
C)  social and counselling psychology
D)  developmental and social psychology

Specialization

The process of focusing on and becoming an expert in a particular subject or skill, often leading to increased efficiency and proficiency.

Research-oriented Psychology

A branch of psychology focused on conducting studies and experiments to acquire knowledge about human behavior and mental processes.

Clinical

Pertaining to or used in the diagnosis and treatment of disease or disorders, often in a hospital or specialized facility setting.