- Most banks are established
a. as corporations.
b. by local governments.
c. to be credit unions.
d. to fulfill reserve requirements.

a. as corporations.

Explanation:

Local governments cannot establish banks. Therefore, option B is the wrong answer.

A bank cannot be a credit union. It is a member-owned cooperative business that shares profit. Therefore, option C is not the answer.

The only central bank is established to fulfill the reserve requirement. Hence, option D is incorrect.

Banks are established by the help of institutional investors or shareholders' equity. Therefore, most banks are established as a corporation. So, option A is the answer.