A research in which a researcher attempts to determine the cause of existing difference in the behaviour of an individual is called?

A research in which a researcher attempts to determine the cause of existing difference in the behaviour of an individual is called?
(a) Descriptive
(b) Historical
(c) Correlation
(d) Causal Comparative
✅ Answer: (d) Causal Comparative
Explanation: Causal-comparative research looks for causes of existing differences.