When Juliet tells Romeo's "happy" dagger that "this" is its sheath, what is she referring to as "this"?

Juliet, heartbroken after finding her dead lover, wants to join him in death, and and is fortunate to find Romeo's weapon, a dagger. She personifies the dagger as being happy, for she on impulse, is happy to give her life and end her misery. Juliet also metaphorically compares her body to a sheath, which is where she will insert the dagger

Explanation:

Hope this helps!

i think its,

b) the narrator's mental state is anguished.

happy to

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