If the Federal Reserve buys $8,500 worth of securities from non-bank public, and the non-bank public then keeps the payment from the bank as cash, then
a: R increases by $8,500 and the MB rises by $8,500
b: C and R both increase by $8,500, and the MB does not change
c: C increases by $8,500 and the MB increases by $8,500
d: C increases by $8,500 and the MB does not change