Concept:Modern retailing focuses on automated, self-service methods rather than traditional fixed stores.
Explanation:Kiosks, mobile shops, and tied shops are older, more traditional forms of retail outlets.
A vending machine is an electronic device that automatically gives a product to a customer after money is inserted.
This reduces the need for a human attendant and allows selling at any time.
It is a clear example of a modern retail trend because it uses technology and automation.
Thus, the best answer is the vending machine.
Answer:C. Vending machine