Option 1 -> Uses "like" or "as" for comparison, which is absent here.
Option 2 -> The eye is directly compared to "a bullet" without using "like" or "as", making it a direct comparison.
Option 3 -> Would require giving human qualities to non-human things, but the eye is being compared to an object.
Option 4 -> While there's exaggeration, the primary device is the direct comparison itself.
Hence, Metaphor -> The phrase directly equates the poet's eye with "a bullet" without using comparative words like "like" or "as". The appositive "a bullet" creates a direct, implicit comparison that emphasizes the threatening, piercing nature of the poet's gaze toward Deven -> correct