Final answer:
Horatio exposed Auralia to seek justice and avenge the alleged murder of his sister's son, utilizing a staged resurrection to reveal her guilt to the public.
Step-by-step explanation:
The reason why Horatio exposed Auralia in Apuleius's 'The Golden' can be traced to an intense desire for vindication and justice for the wrongs committed by Auralia. In a highly dramatic and public manner, Horatio orchestrates a scene where a false resurrection of a supposedly dead young man takes place. Through this orchestrated 'miracle,' the truth about Auralia's treachery and her role in the young man's 'death' is revealed to the public.
Horatio's actions are fueled by grief and the need to correct a grave injustice. The emotionally charged and dramatic scene is characterized by its appeal to supernatural intervention for truth-seeking, thus playing on the beliefs and sensibilities of the audience to ensure Auralia's guilt is plainly seen and that she faces retribution.