Concept:Impulse buying means an unplanned purchase made suddenly because of attractive product placement or display.
Explanation:Supermarkets are designed for self-service.
They keep products on open shelves where customers can see and touch them easily.
They also place small, tempting items like chocolates and magazines at the checkout.
This encourages shoppers to pick up extra goods without prior planning.
In contrast, hawkers, co-operative shops, and mail order firms do not normally provide such strong impulse-buying triggers.
Thus, out of the given options, a supermarket is the best example of a place that encourages impulse buying.
Answer:C. supermarket