The lines from Beowulf that develops the theme that a hero should win glory through acts of bravery is:
According to the epic poem Beowulf, the poet writes about a powerful and courageous warrior who comes to the help of the Danes to defeat and kill the monster Grendel that has been terrorising them for a long time.
Furthermore, the poet talks about his acts of bravery that Beowulf undertakes when he goes alone to battle Grendel in his lair.
Therefore, the correct answer is option D.
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