The correct option is A, the key function of the bank is to be an intermediary between savers and borrowers.
It should be noted that banks that are financial intermediaries that generate earnings when they allow the transfer of money from savers to borrowers by paying savers a smaller return than they demand from borrowers. This earning is their charges for the service rendered.
Financial intermediaries are the institutions they have been put in place like a building society, bank, or unit-trust company, which are charged with the responsibility of holding funds from the lenders so that loans will be made available to people that wants to borrow.
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