Why is the Twelth Federal Reserve district so geographically large, while the Second Federal Reserve district is so small by comparison?

A$.$ The districts represent the population and economic interests in $1913$ when the Federal Reserve Act was created.

B$.$ The larger size of the Twelth Federal Reserve district is the result of lobbying by bankers and business people.

C$.$ The size of the Second Federal Reserve district reflects its importance and special role in the Federal Reserve System.

D$.$ The size of the district reflects its relative importance in the Federal Reserve system: The smaller Second district is economically less important than the very large Twelfth district.