What are the two main types of research methods used in psychology

A)  experimental and case study research methods 
B)  descriptive/correlational and case study research methods 
C)  descriptive and correlational research methods 
D)  experimental and descriptive/correlational research methods

The two main types of research methods used in psychology are experimental and descriptive/correlational research methods. Experimental research involves manipulating variables and observing the effects in a controlled environment, while descriptive/correlational research methods involve observing and describing behaviors or relationships between variables without manipulating them. Case study research methods are a type of descriptive research, while there is no option for only one type of research method in the answer choices.