Question

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this photograph, titled migrant mother, is of florence owens thompson and her children.
it was taken by photographer dorothea lange in 1936 in nipomo, california.
at the time the photo was taken, lange was photographing migratory farm labor for the resettlement administration, an agency of the us government.
to identify the purpose of this photograph, it would be most helpful for a historian to conduct more research on
photographs that dorothea lange took when working for other customers.

the city of nipomo, california.

the lives of florence owens thompson and her children.

the mission of the resettlement administration, the agency that hired lange.

Explanation:

To determine the purpose of the "Migrant Mother" photograph, analyzing the mission of the Resettlement Administration (the agency that hired Lange) is most relevant. The photo was taken while Lange was working for this government agency, so understanding its mission would clarify the photograph’s purpose (e.g., documenting migrant labor conditions for policy/relief efforts). Other options (Lange’s other work, Nipomo’s details, or the subjects’ personal lives) are less tied to the photograph’s intended purpose as part of the agency’s work.

Answer:

The option: "the mission of the Resettlement Administration, the agency that hired Lange."