Twilight by Sara Teasdale

Dreamily over the roofs
The cold spring rain is falling,
Out in the lonely tree
A bird is calling, calling.
Slowly over the earth
The wings of night are falling;
My heart like the bird in the tree
Is calling, calling, calling.
How does the punctuation in the poem enhance its meaning?
A.
by distinguishing the events that take place at a certain time of day
B.
by inserting a stop that makes the reader think of the cold rain
C.
by shifting the focus between nature's needs and the human heart's
D.
by emphasizing the bird's action and speaker's similar response