Final Answer:
Victoria Guzman fails Santiago by withholding the truth about his father's murder.
Step-by-step explanation:
Victoria Guzman, Santiago Nasar's housekeeper and lover, fails him by choosing to conceal the truth regarding his father's murder rather than offering him the chance to evade danger. Her silence ultimately contributes to Santiago's tragic fate. Despite being aware of the impending danger from the Vicario twins seeking revenge for their sister's honor, Guzman remains complicit by not warning Santiago.
Luis Enrique, Santiago's friend, fails by not conveying the severity of the threat posed by the Vicario brothers to Santiago, assuming he's already aware. His assumption leads to a lack of communication, preventing Santiago from taking necessary precautions.
Additionally, Father Amador fails Santiago by overlooking his responsibility to act on the warnings and prevent the impending tragedy. His indifference and failure to take appropriate action to intervene reflect a lack of concern for Santiago's safety. Ultimately, it's Victoria Guzman's silence and withholding of critical information that significantly contributes to Santiago's tragic demise.