They had the Nile with them which was the best natural resource out there. The river would help them have great and fertile soil, which they could also irrigate and have an easy job developing agriculture.
The correct answer is primary appraisal.
According to Lazarus's theory of stress, primary appraisal refers to the process wherein individuals form a judgement or an evaluation of a stressor (an external factor or stimulus that can potentially cause stress) when they are first faced with it. Individuals might either evaluate and judge the stressor as being either a challenge or threat. For instance, if you notice that someone has been following you for a few blocks, through the process of primary appraisal you will determine whether or not its a threat.