What two actions by households and​ firms, banks, or the central bank will cause the value of the money multiplier to increase​?
a. A decrease by households and firms in their holdings of currency relative to their holdings of chequing account​ deposits; a decrease in​ banks' ratio of​ reserves-to-deposits.
b. An increase by households and firms in their holdings of​ currency; a decrease in​ banks' holding of deposits.
c. A decrease by households and firms in their holdings of chequing account deposits relative to their holdings of​ currency; an increase in​ banks' ratio of​ deposits-to-reserves.
d. An increase by households and firms in their holdings of currency relative to their holdings of chequing account​ deposits; an increase in​ banks' ratio of​ reserves-to-deposits.