What experiment did the National Fair Housing Alliance $($NHFA$)$ do$?$ A$.$ The same person called insurance offices asking about renters$$ insurance using a $$white voice$$ and a $$Black voice$$ to see the different treatment. B$.$ Called $150$ insurance offices to ask if they pay attention to race when approving renters$$ insurance. C$.$ Compared $150$ cases of Black, Latino, and white callers seeking renters$$ insurance, to see if callers were linguistically discriminated against. D$.$ Called on the phone using a $$white voice$$ to get a house showing, then showed up to see if they would be racially discriminated against.