Answer:
A) Twelve banking districts created by the Federal Reserve Act
Step-by-step explanation:
The Federal Reserve Act of 1913 created the US federal Reserve system. It wad created to establish economic stability in the US and established a central bank to supervise the monetary policy. The act also built twelve federal reserve districts and one federal reserve banks for each of the district. All the federal reserve banks implement the monetary policy decided by the Federal Open Market Committee.