They Had Rich, Black Soil that lined the Nile, and they were able to grow an array of crops, Which were quite Successful and Ideal for necessary crops.
Answer:
Evidence, clues, or pieces of the past
Explanation:
They need some way of knowing, so they study evidence,clues, and pieces of the past to figure out history.
The answer is D. Stalin believed that the Marshal Plan would restore Germany and make it a threat again