The quotation that best supports the idea of vengeance in "A Story of Vengeance" is:
A. "I grew cold and proud, and with an iron will crushed and stamped all love for him out of my tortured heart and cried for vengeance." (Paragraph 13)
This quotation captures the protagonist's transformation from love to a desire for vengeance, illustrating the emotional turmoil and determination that drives the story's theme of vengeance.