Monetary policy involves regulating the supply of money and
a.)credit
b.)supplies
c.)natural resources
d.)markets

Credit is the answer i would have to choose. 

I believe that answer would be A. Credit

Monetary policy involves the money supply and the availability to credit in the economy 

the two sets of lines are :

and remember beauty,five-wits,strength,and discretion ,they all at the last do everyman forsake (to leave forever ) for after death amends may no man make,for then mercy and pity doth him forsake.(to leave forever )