Answer: Option (B) is correct.
Step-by-step explanation:
There are four functions of money are as follows:
(i) Medium of exchange
(ii) Store of value
(iii) Measure of value( unit of value)
Measure of value is a function of money which enables us to measure the value of different goods and services that a consumer wants to buy or seller wants to sell in monetary terms.
Therefore, we can easily measure the value of mp3 player in monetary terms i.e. it is worth two hundred dollars.