Final answer:
Cross selling is exemplified by suggesting complementary items, like a scarf and gloves, when a customer buys a related product, such as a winter coat. It differs from tying sales and bundling because it's not a requirement, just a suggestion.
Step-by-step explanation:
The concept of cross selling is best represented by option d: Showing a customer a matching scarf and gloves when the customer purchases a winter coat. Cross selling involves suggesting additional products that complement or are related to the item being purchased. Unlike tying sales or bundling, cross selling does not require a customer to purchase additional products but instead offers related items that might enhance the customer's use or enjoyment of the primary product.