Question

Question was provided via image upload.

Explanation:

• Cave paintings were more associated with pre - agricultural or early hunter - gatherer societies, not river valley civilizations which were agricultural.
• Most ancient river valley civilizations (like Mesopotamia, Egypt, Indus Valley) were polytheistic, and monotheism developed later (e.g., Judaism).
• Democratic traditions started to develop in city - states like Athens much later than the time of ancient river valley civilizations.
• Ancient river valley civilizations (e.g., Mesopotamia with its canals, Egypt with the Nile - based irrigation) relied on irrigation systems to water their crops for agriculture, which was the basis of their civilizations.

Answer:

The use of irrigation systems