The correct option is C Margin Requirements
Margin requirement refers to the difference between the current value of the security offered for a loan (called collateral) and the value of the loan granted. For example- a person mortgages his house worth one crore rupees with the bank for a loan of 80 lakh rupees. The margin requirement, in this case, will be 20 lakh rupees. It is a qualitative method of credit control adopted by the central bank in order to stabilize the economy from inflation or deflation.