Final answer:
Option B, where a general attempts a desperate attack on an enemy position but is defeated, best fits the traditional definition of tragedy.
Step-by-step explanation:
Based on the traditional definition of tragedy, the story idea that best fits this definition is option B: A general attempts a desperate attack on an enemy position but is defeated. In the traditional sense of tragedy, the protagonist is a powerful figure who suffers a downfall due to a flaw or error in judgment. This idea aligns with Aristotle's concept of tragedy, which involves a character of high status facing a reversal of fortune caused by their own actions or circumstances beyond their control.