Which is an Islamist belief?

A- Western, non-Islamic customs should be tolerated in Islamic nations.

B- Social customs, with the exeption of religion, should be based on the ethnic background of the people.

C- All aspects of society - political, legal, economic, social, and cultural - should be guided by strict Muslim teaching.

D- Religion should be guided by strict Muslim teaching. All other apsects of society - political, economic, and legal - should be secular in nature.