Final answer:
The Nile River's floods were more regular than those in Mesopotamia.
Step-by-step explanation:
The correct answer is d) regular.
The floods of the Nile River were more regular than those in Mesopotamia. The flooding of the Nile was predictable and occurred annually, providing fertile soil for agriculture. In contrast, the floods in Mesopotamia were more unpredictable and often resulted in destructive flooding.
For example, the regular floods of the Nile allowed ancient Egyptians to develop an advanced system of agriculture, utilizing the fertile soil brought by the floods. This contributed to the prosperity and stability of ancient Egypt.