Which of the Following Was a Feature of Egyptian Rather

Which of the following was a feature of Egyptian rather than Mesopotamian civilization?

A) Salinization of the soil,which led to a collapse in the production of wheat
B) Frequent and devastating invasions by outsiders because of a lack of physical barriers
C) A more cheerful and hopeful outlook on the world,as expressed in part through religious beliefs
D) A long tradition of written law codes based on the notion of natural rights