A historian is interested in studying the role of women during the Industrial Revolution. He finds a recently published secondary source that includes this information: The Wealthiest Women During the 19th-Century Industrial Revolution:

• Were able to hire servants to do the majority of housework

• Often worked for charities or became activists

• Pushed for social reforms such as women's rights and the right to vote

Which piece of information would most help him understand the historical context of these facts?

A. A 19th-century pamphlet claiming that women should be more concerned with helping others than participating in politics

B. A 19th-century newspaper article listing the names of a few women who had recently completed charity work

C. A 21st century data set estimating the total number of women living in London during the Industrial Revolution

D. A 21st century research paper describing the social roles of women in societies that have not yet industrialized