Which of these is most associated with an ethnic group> a) arab b) christian c) jewish d) muslim

I am pretty sure the answer is A) Arab. The other three, Christian, Jewish, and Muslim, are religious groups or religious terms and they are not associated with an ethnic group and or groups. I hope this helps you. If I am incorrect then will someone please correct me. But like I said at the beginning of my answer I am pretty sure the answer is A) Arab.