According to question, cultural regions have firm easily delineated boundaries.
Option D is correct .
Each cultural region is unique due to its language, religion, government, use of the land, education system, and customs. Geographers recognize the Middle East, Latin America, North America, Europe, Russia, Sub-Saharan Africa, China, Japan, South Asia, and Southeast Asia as some of the major cultural regions in the world today.
Historically, internal characteristics that convey a sense of place have been used to define regions. Whether a region is formal, functional, or vernacular, their boundaries change depending on the type; each has a distinct meaning and intended use.
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