There Is a Close Relationship Between Sociology and the Other

There is a close relationship between sociology and the other social sciences.Given how much overlap there is between these fields,why does sociology still exist as a discipline?

A) All the other fields are more specialized, but sociology is a field that considers a huge intellectual territory.
B) Sociology does not use historical context.
C) Sociology departments are an academic tradition and would be difficult to disband.
D) Political science and economics departments are much more politically conservative, so sociology is needed to provide a liberal counterbalance.