The correct answer is B.
When you think of a curtain, it always divides something, even in its most literal sense (it divides a window from a room). The Iron Curtain was a specific ideological division between the Soviet Union and the West during the Cold War.
Answer: Introspection
Explanation:
The introspection is the term which is refers to the analyzing your own personality and the actions for the purpose of self-awareness.
The introspection is the process of evaluating the own feelings behavior and the thoughts.
According to the given question, the introspection is refers to the procedure that is mainly used in the study for structuring the thoughts in our mind and it is one of the important method for investigation the given information.
Therefore, Introspection is the correct answer.
