How did the ancient Egyptians use the Nile River to combat drought? They built reservoirs to drain water away.
They used silt to build dams to store water.
They dug irrigation canals along the Nile River to water fields.
They moved fresh water from the cataracts of the Nile River.

The third one

Explanation:

They dug irrigation canals along the Nile River to water fields.

Inflation is a quantitative measure of the rate at which the average price level of a basket of selected goods and services in an economy increases over a period of time. Often expressed as a percentage, inflation indicates a decrease in the purchasing power of a nation's currency.