What were the eastern, western and northern boundaries of egyptian settlement ?

The eastern boundary was the eastern part of the Dead Sea, up to Damascus, Kadesh and Carchemish. 
The western boundary was the Mediterranean Sea and consisted of the cities of Tyre, Sidon, Byblos and Gaza. In the south western boundary this also included Tanis in Egypt and extended to Libya.
The northern boundary was the city of Carchemish above Damascus in Syria.

The correct answer is b