The correct option is A reduces
Cash Reserves Ratio (CRR) refers to the
proportion of total deposits of the commercial banks which they must keep as reserves with the central bank in the form of cash. By increasing
the cash reserve ratio, the commercial banks has to maintain more cash with the
central bank which reduces their credit creation capacity and therefore
money supply in the economy also reduces. Therefore, increase in cash reserve ratio(CRR) reduces the money supply in the economy.