Which group of countries best reflects the global distribution of Islam?

The choice of Indonesia, Turkey, and Nigeria accurately reflects the global distribution of Islam as these countries are significant in their Muslim populations and represent diverse cultural contexts within the religion.

Indonesia is the country with the largest Muslim population in the world, showcasing the prevalence of Islam in Southeast Asia. Turkey is a nation that serves as a bridge between Europe and Asia, playing a central role in the history of Islam and being home to a large Muslim majority. Nigeria is noteworthy for having one of the largest Muslim populations in Africa, and it exemplifies the religion's influence and diversity on the continent.

Overall, this selection emphasizes not only the quantitative presence of Muslims in these regions but also the geographic and cultural diversity of Islamic practices and beliefs globally.