Answer:
Social Epidemiology
Step-by-step explanation:
Rachel's study would be part of the field of social epidemiology. Social epidemiology is a branch of epidemiology that focuses on how social and economic factors contribute to health outcomes and health disparities. It involves studying the distribution of health outcomes and their determinants within and between populations, with a focus on understanding the social and structural factors that shape these patterns. In Rachel's study, she would be examining the impact of the Zika virus on individuals in different social classes, and how these differences might be related to social and economic factors. This type of study is important for identifying and addressing health disparities and for developing interventions to improve health outcomes for disadvantaged populations.