The house un-american activities committee (huac) gained much attention in the 1940s and 1950s for its investigation of

The answer would be west.

Well, by looking at your question and also your answers that you have provided your answer to your question is going to be choice a) protestants.this is because they had been a member of or follower of any of the western christian churches. these churches had been separated  from the roman catholic  church and they follow the principles  of reformation, and baptism, and also the luthern churches, and finally  the  presbyterian.i hope this mark me as brainiest