I’ll give brainlist to whoever answers correctly

Read the following excerpt from "Grass" by Carl Sandburg:

And pile them high at Gettysburg
And pile them high at Ypres and Verdun.
Shovel them under and let me work.
Two years, ten years, and the passengers ask the
conductor:
What place is this?
Where are we now?
I am the grass.
Let me work.

Which sentence best analyzes the poet's use of allusion in this passage?

A. The speaker of the poem addresses the grass, implying that he
can communicate with nature.

B. The speaker refers to Gettysburg to suggest that grass can hide
even great battle losses.

C. The speaker mentions great battles in hopes to inspire patriotism
in the reader.

D. The speaker refers to Ypres and Verdun to imply that the grass
cannot conceal all human activities.