Final answer:
Cultural background and dietary preferences are social factors that impact what groceries are purchased.
Step-by-step explanation:
A social factor that might impact what groceries are purchased is cultural background or dietary preferences. Different cultures have specific dietary customs and preferences that influence the types of groceries they purchase. For example, in cultures where fish is a staple food, individuals are more likely to purchase a variety of fish products. In addition, dietary preferences such as vegetarianism or veganism can also impact the types of groceries purchased, as individuals following these diets will prioritize plant-based food products.