This wave ... As the pogrom spread, units of the SS and Gestapo (Secret State Police), following <span>Heydrich's instructions, arrested up to 30,000 Jewish males, and transferred most of them from local prisons to Dachau.</span>
Yeah I think it’s most likely A!
Answer:
The most convincing 'internal' factor behind southern defeat was the very institution that prompted secession: slavery. Enslaved people fled to join the Union army, depriving the South of labour and strengthening the North by more than 100,000 soldiers. Even so, slavery was not in itself the cause of defeat.