Concept:The speaker is identified by the tone and content of the soliloquy, which expresses unrequited love for Demetrius.
Explanation:The lines describe how Demetrius once swore his love only to the speaker.
He then saw Hermia's eyes (“Hermia's eyne”) and his oaths melted away like hail under heat.
This complaint of being abandoned for Hermia is made by Helena.
She is lamenting that Demetrius now loves Hermia instead of her.
The poetic language and personal anguish reveal Helena's perspective.
Thus, the speaker is not Demetrius, Egeus, or Hermia.
Answer:D. Helena