Which of the Following Methodological Approaches to a Research Project

Which of the following methodological approaches to a research project on internal migration from rural to urban areas is an ethnography?

A) A researcher distributes paper questionnaires to individuals in rural areas in South America asking their reasons for staying in rural areas and their experiences with friends and neighbors who have moved to cities.
B) A researcher conducts a series of interviews with individuals about their motivation for moving to cities from rural areas in Argentina.
C) A researcher examines the different reasons to move to urban areas in Africa vs.in South America.
D) A researcher asks individuals in rural villages in northern Africa their opinions about (randomly) only one of the two following conditions: whether a long-term drought would cause them to leave a rural area for an urban area,or whether conflict among village leadership would cause them to leave a rural area for an urban area.