The correct answer is D. All of the above.
Collective psychology of the whole period is a theory which can explain all phases of historical development, means the psychology of the whole society, and means psychological approach of the collection.
This theory is based on the idea that the collective psychology of a society is the sum total of the individual psychologies of the members of that society. It argues that the collective psychology of a society can be studied through the study of the individual psychologies of its members, and that the collective psychology of a society can be used to explain the historical development of that society.
The theory of collective psychology of the whole period has been used to explain a wide range of historical phenomena, including the rise and fall of civilizations, the development of religions, and the outbreak of wars. It has also been used to explain the behavior of individuals in groups, such as the behavior of soldiers in battle or the behavior of fans at a sporting event.
The theory of collective psychology of the whole period is a controversial one, and it has been criticized by some scholars for being too simplistic. However, it remains a popular theory among historians and social scientists, and it continues to be used to explain a wide range of historical phenomena.
Here is a brief explanation of each option:
A. Can explain all phases of historical development: This option is correct because the theory of collective psychology of the whole period argues that the collective psychology of a society can be used to explain the historical development of that society.
B. Means the psychology of the whole society: This option is correct because the theory of collective psychology of the whole period is based on the idea that the collective psychology of a society is the sum total of the individual psychologies of the members of that society.
C. Means psychological approach of the collection: This option is correct because the theory of collective psychology of the whole period is a psychological approach to the study of history.