The correct option is e. old age.
The tragic end of the hero Beowulf is primarily attributed to option E: old age. In the epic poem "Beowulf," the protagonist faces a dragon during the latter part of his life. Despite his unparalleled strength and heroic deeds throughout his youth, Beowulf grapples with the inevitability of aging. The dragon, guarding a hoard of treasure, becomes a formidable adversary for Beowulf. In the fierce battle that ensues, Beowulf, now an elderly king, valiantly fights but is ultimately mortally wounded.
Beowulf's demise is not a result of envy, hubris, foolishness, or desertion. Envy and hubris were not characteristic of Beowulf's personality, as he was known for his noble and selfless deeds. Likewise, foolishness and desertion are not factors in his tragic end. Instead, the narrative emphasizes the hero's final test and the inevitability of mortality, highlighting the cyclical nature of life and the passing of generations.
In summary, Beowulf meets his tragic end due to the inexorable advance of old age, symbolized by his battle with the dragon, a poignant conclusion to the heroic saga.