Respuesta :
"a. Immigration restrictions were expanded as fears of communist infiltration from Soviet bloc nations spread" would be the best option from the list, since McCarthy instilled a feeling of paranoia about communism in the US.
The statement which explains how McCarthyism affected domestic policy in the 1950's was a) Immigration restrictions were expanded as fears of communist infiltration from Soviet bloc nations spread. This was largely to stop people from predominantly Asian countries from coming to the United States, as well as deporting Mexican-Americans and barring Jews from fleeing World War II in Europe. These bills were hugely controversial.