The most accurate general statement you can make about the standard of living in the Middle East, based on the comparison of Afghanistan and Qatar, is:
B. The standard of living varies across the region.
This is because different countries within the Middle East have significantly different economic conditions, resources, and social services, leading to a wide range of living standards. Qatar, for example, generally has a high standard of living due to its wealth from natural resources, while Afghanistan struggles with socio-economic issues that contribute to a much lower standard of living.