How the other half lives by Jacob Riis. Need help with the questions

Where did people have to work with great organization to be successful at farming? a. on the yellow river basin c. on the hangzhou bay b. on the yangzi river basin d. on the hubei basin

Which piece of information would most a historian create an interpretation of this photograph of works in a factory?

Why would the free rider problem prevent a private business from investing in the building of a city sidewalk?