38. Assume the whole banking system does not hold excess reserves and the
required reserve ratio is 20%. If a person withdraws $100 from a bank,
A. the amount of loans made by the banks to the public will fall by at
most $400.
B. money supply will fall by at least $400.
C. the amount of deposits in the banking system will fall by at least
$500.
D. the amount of cash reserve of the banks will fall by at most $80.
why a?