The accurate statement about ethnic groups in Southwest Asia is:
c) Arabs make up the largest ethnic group in the region.
Here's a brief explanation of why the other options are inaccurate:
a) Kurds make up the largest ethnic group on the Arabian Peninsula. - This is incorrect; Arabs are the predominant ethnic group in the Arabian Peninsula.
b) Arabs are the majority in every country in the region. - This is not true; while Arabs are the majority in many countries, there are significant ethnic minorities in several countries in Southwest Asia.
d) People in the same ethnic group follow the same religion. - This is also inaccurate; ethnic groups can encompass diverse religious beliefs. For example, there are Arab Christians and Muslims, as well as Kurds who may practice different religions.