Recommending additional items that complement a customer's purchase, such as shoe cleaner to go with new leather shoes is called: C. cross selling.
What is cross selling?
Cross selling can be defined as a sales and marketing technique that involves a buyer recommending complementary products to existing customers, so as to boost the level of sales.
In this context, we can infer and logically conclude that an example of cross selling is recommending additional items that complement a customer's purchase, such as shoe cleaner to go with new leather shoes he or she purchased.
Read more on cross selling here: https://brainly.com/question/4978438
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