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