Given Harriet Martineau's contributions to sociology, which of the following categories best describes her primary focus in her works?

Harriet Martineau was an important figure in sociology, and her primary focus was on social issues and the lives of people in society. She studied how different factors like class, gender, and race influenced people's experiences and opportunities. For example, in her work "Society in America," she examined how the culture and economy of the United States affected its citizens, especially women and the poor. Martineau believed that understanding these social dynamics was crucial for creating a fairer society. Her approach helped lay the groundwork for future sociologists to explore and address social injustices.