Step 1: Locate Aswan.
Aswan is a city in Egypt. The famous Aswan High Dam is situated nearby.
Step 2: Name the river.
Egypt’s lifeline river is the Nile; the dam controls its floods, provides irrigation, and generates hydroelectric power.
Step 3: Eliminate Indian and unrelated rivers.
Amazon (South America), Krishna and Godavari (India) are not related to Aswan.
Step 4: Conclusion.
Therefore, the answer is (A) Nile.