a main indicator of the spread of homelessness during the great depression was\nbread lines.\nunemployment.\n…

Brief Explanations:

Hoovervilles were shantytowns built by homeless people during the Great Depression. They were named after President Herbert Hoover, who was blamed for the economic crisis. Their existence was a visible sign of the spread of homelessness. Bread - lines were for food distribution, unemployment is a related but different economic indicator, and westward migration was not a main indicator of homelessness spread.

Answer:

C. Hoovervilles