Most african kings obtained slaves for sale by a) purchasing them from europeans. b) capturing them as prisoners of war. c) inheriting them from captured kings. d) purchasing children as slaves from their parents.

.parents sold their children, men their wives, and one brother the other and prisoners of war. So D, purchasing children as slavees from their parents.

A common way how young Egyptians could have risen in social status was to show great proficiency in battle or to show that he was 'favored by the gods'. The latter could have been done in many ways which can be discussed. But in general, these are two very common ways how they could have gained social status.