Read the poem below and answer the question.

The courage that my mother had
Went with her, and is with her still:
Rock from New England quarried;
Now granite in a granite hill.

The golden brooch my mother wore
She left behind for me to wear;
I have no thing I treasure more:
Yet, it is something I could spare.
Oh, if instead she’d left to me

The thing she took into the grave!—
That courage like a rock, which she
Has no more need of, and I have.

(Edna St. Vincent Millay, “The Courage My Mother Had”)

In the poem above, who is the speaker?

a mother

a father

a son

a daughter