Demographics encompass a range of attributes that can illuminate patterns of inequality within societies. Notably, the interaction between ethnic background, socioeconomic status, and education level can create significant disparities. For instance, consider a study examining healthcare access among various demographic groups in a metropolitan area. The study shows that minority ethnic groups with lower income levels face more barriers to healthcare access compared to affluent white populations. Which of the following explanations aligns best with sociological understandings of how these demographic factors influence health inequalities?