Final answer:
Cloud storage is the best option for storing data for a supermarket due to its remote accessibility and scalability.
Step-by-step explanation:
The type of storage device that could be used to store data for a supermarket is c) Cloud storage. Cloud storage provides remote accessibility, which means that the data can be accessed from anywhere with an internet connection. This is beneficial for a supermarket because it allows employees to view and update data in real-time, even from different locations. Additionally, cloud storage offers scalability, meaning that the amount of storage can easily be increased or decreased as needed.