How can this be achieved?

Northern Trail Outfitters’ marketing team includes the nearest store to customers in the template of its emails. This data extension only needs to be updated when store information changes, such as when a new store opens or a store closes.

How can this be achieved?
A . Create an automation to begin when Information changes on a store object using a workflow rule.
B. Create a scheduled automation to import the file on a recurring basis with store information.
C. Create a file drop automation to import the file when placed on the specified directory on the Enhanced FTP.
D. Create a file drop automation to initiate when the store’s data extension is updated via import.

Answer: C