Use the Following to Answer Questions

Use the following to answer questions :
Scenario: Holding Cash
Suppose that the public holds 50% of the money supply in currency and the reserve requirement is 20%. Banks hold no excess reserves. A customer deposits $6,000 in her checkable deposit.
-(Scenario: Holding Cash) Look at the scenario Holding Cash. As a result of the deposit, required reserves will increase by:

A) $0.
B) $1,200.
C) $3,000.
D) $6,000.