The correct identification based on historical classifications is:
Greece and Rome are classical civilizations.
To clarify the others:
- Mesopotamia is indeed a river valley civilization, but Greece is generally classified as a classical civilization rather than a river valley civilization.
- West Africa has empires that are classified in different ways (like the Mali or Songhai empires), but it is not typically classified as a classical civilization in the same way as Greece and Rome. China is considered a classical civilization.
- Egypt is considered a river valley civilization, and the Indus Valley (Harappan) civilization is also a river valley civilization, not classical.
Thus, the best classification from your options is the one stating Greece and Rome as classical civilizations.