Answer:
B
Explanation:
Money as a medium of exchange means money can be used a means of payment. That is, money is used is sorting everyday transactions. Recall that there are three motives of holding money;
1. Transactionary
2. Precautionary
3. Speculative
Transactionary motive means you can use money to sort your everyday transactions.
Precautionary motive - You can save money for rainy days. (i.e. accident, sickness etc)
Speculative motive means you can use money to invest - make investment decisions with money (buy treasury bills, money market fund instruments, currency, etc)
All of the above motives can not be achieved if money does not serve as a means of payment.
Money as a medium of exchange means the legal tender (money) has a government backing.