The definition of shiver that seems to gets fit in the use is to quiver or vibrate. The correct option is a.
A shake slightly and uncontrollably as a result of being cold, frightened, or excited is recognized as shiver.
The missing passage is:
Willows whiten, aspens quiver,
Little breezes dusk and shiver
Thro' the wave that runs forever
By the island in the river
Flowing down to Camelot.
Four gray walls and four gray towers,
Overlook a space of flowers,
And the silent isle embowers,
The Lady of Shalott.
As per the given scenario, the meaning of shiver in line 2 indicates definition seems to fit this use is to quiver or vibrate.
Thus, the correct option is a.
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