Answer:
The correct answer is option d.
Step-by-step explanation:
When $500 is kept in the piggy bank, it represents the store of value function of money,as currency notes are used to store a value of $500 for future use.
The price of laptop is $500, this price represents the unit of account function of money. Money here is being used to represent the value of laptop.
The $500 saved in piggy bank is used to purchase the laptop, this represents the medium of exchange function of money. Here money is being used to exchange goods and services.