Arepetitive image or idea in a text is a

motif

Explanation:

A motif is an idea, object, or concept that repeats itself throughout a text. A motif reinforces ideas an author wants to emphasize.

beowulf sets out on his journey for daneland. -- 1

hrothgar welcomes beowulf. -- 2

beowulf waits for grendel to attack heorot. -- 3

beowulf succeeds in defeating grendel by tearing off his arm. -- 4

beowulf fights with grendel’s mother. -- 5

beowulf sets out for his fight with the dragon. -- 6

beowulf sets out for his geatish homeland. -- 7

b is the answer for this question.