Answer:
Correct answer is 1. They both believed in the concept of ka.
Step-by-step explanation:
Option 1 is +correct as Egyptians believed in the concept of ka, but Nubians did not.
Option 2 is not correct as both civilizations were developed in the valley of river Nile.
Option 3 is not correct as both areas were rich with metals, therefore were great metalworkers.
Option 4 is correct as Nubians borrowed system of writing from Egyptians.