Of all the indignities man has suffered at the hands of man, slavery is perhaps the most degrading.

Answer: Option A

Insult : speak to or treat with disrespect or scornful abuse.
Atrocities : an extremely wicked or cruel act, typically one involving physical violence or injury.
Evils : profound immorality and wickedness, especially when regarded as a supernatural force.
Dangers : the possibility of suffering harm or injury.
Indignities : treatment or circumstances that cause one to feel shame or to lose one's dignity.

Synonym of Indignities is Insult