In which Old English epic poem does the earliest depiction of a fire-breathing dragon in English literature appear?

Explanation

The earliest known representation of a fire-breathing dragon in English literature is found in the Old English epic poem 'Beowulf'. The other works listed, such as 'The Iliad' and 'The Odyssey', are ancient Greek epics and do not feature dragons, while 'The Canterbury Tales' is a Middle English collection of stories without such mythical creatures.