How does H. T. Johnson use sarcasm in his poem "The Black Man's Burden"?

A.
He scorns the concept of labeling people by their skin color by labeling people "Red" and "Brown."

B.
He says the natives are powerful but mocks their inability to fight off British rule.

C.
He ridicules the natives' "laughter" towards British "help" to teach a civilized life.

D.
He calls the imperialist armies "fearless" but also says they are fighting "feeble folks."