Answer:
The correct answer is letter "D": and checking accounts are all stores of value, but only checking accounts commonly function as mediums of exchange.
Explanation:
Stocks, bonds, and checking accounts store value in the form of interest within a specific period of time. However, only checking accounts are mediums of exchange since they are accepted as a standard for transaction purposes by a wide range of merchants. In other words, while making a purchase at a store it is almost impossible to pay with stocks or bonds.