Final answer:
The rise of online retailers has led to the closure of many department stores due to a change in the number of sellers.
Step-by-step explanation:
The factor that best relates to the scenario of department stores shutting down with the rise of online retailers is change in the number of sellers. Online retailers have increased in number and have attracted customers away from traditional department stores. This change in the market has led to the closure of many department stores.
Learn more about The impact of online retailers on traditional department stores