They restricted African Americans freedom
"b. Ben Bernanke became chairman of the federal reserve in 2006" is the only factual sentence from the options listed. The others are opinions or haven't happened yet.
The government's efforts were "primarily designed to provide housing to white, middle-class, lower-middle-class families," he says. African-Americans and other people of color were left out of the new suburban communities.
The suburbs.
Answer:
they compare ways that skin stops harmful germs