Which type of selling focuses on encouraging customers to purchase additional items or upgrades?

The focus on encouraging customers to purchase additional items or upgrades aligns best with suggestive selling. This sales technique involves recommending related products or enhancements that complement a customer's initial choice. For instance, when someone orders a sandwich, suggesting a side of fries or a drink is a typical example of suggestive selling. This method is effective because it not only increases the average transaction value but also enhances the customer’s overall experience by helping them discover products they may enjoy.

While upselling specifically refers to persuading customers to buy a more expensive version of a product or an upgrade—such as opting for a larger size—suggestive selling encompasses a broader range of additional recommendations, making it more fitting for the scenario described. Therefore, the emphasis on additional purchases rather than upgrades or pricier alternatives reinforces the correctness of suggestive selling as the chosen answer.