Both sides believed the war would be short lived, so little attention was paid to prisons.
Mainly through better advancement in technology and our understanding of engineering. What with us going from living in caves to making wooden homes to now living in steel and concrete.
(Sorry this is a late answer lad :( ) But the answer is D. It caused the tribes to lose their culture as they assimilated.
As the tribes were moved from their land, many of them died and the ones who didn't die ended up getting their religion and culture completely removed or assimilated
The word is worried which describes the neighbor who helps the speaker in "Mending Wall" repair the wall. The tone of the main speaker is somehow distant trying to stop that force to love the wall. The neighbor may be worried of the speaker about his situation.
The answer would be letter D.
