Why was agriculture more productive in egypt than in mesopotamia?

The reason why agriculture are more productive in Egypt than in the Mesopotamia was because of the Nile of which resembles a clockwork that made the farmers in Egypt more lucky and led them to be more productive—this had occur when there is an unpredictable occurrence with the Euphrates and Tigris.

it would be d). more resources must be obtained to attain that combination of goods and services