How Has Psychology's Focus on the Different Levels of Analysis

How has psychology's focus on the different levels of analysis changed over the history of the discipline?

A) Brain-level and group-level analyses are more prevalent in today's psychology than they were in the past.
B) Group-level analyses are less prevalent in today's psychology than they were in the past.
C) Individual-level analyses are more prevalent in today's psychology than they were in the past.
D) Individual-level analyses are more prevalent in today's psychology than they were in the past, while group-level analyses are less common now.