From “The Wild Swans at Coole” I have looked upon those brilliant creatures,
And now my heart is sore.
All’s changed since I, hearing at twilight,
The first time on this shore,
The bell-beat of their wings above my head,
Trod with a lighter tread.

Unwearied still, lover by lover,
They paddle in the cold
Companionable streams or climb the air;
Their hearts have not grown old;
Passion or conquest, wander where they will,
Attend upon them still.

What has changed in the speaker since he first heard the swans?

A.
The speaker sees that the swans can no longer walk along the shore.

B.
The speaker can no longer look upon the “brilliant creatures.”

C.
The speaker is older, more tired, and less lighthearted.

D.
The speaker can no longer chase after the swans.