The quick answer is A, I believe.
It is the closest thing to sarcasm in the poem. It is more of a wail that it is sarcasm. It bemoans the fact that you can easily fight people who are not as well equipped as you are to carry on a battle.
He doesn't mock their inability to fight back. The line that is sarcasm isn't mentioned. Laughter drowns out the pain and wailing.
The natives are doing the laughing. The British are.
The red and brown is more or less just a fact.
A is the closest thing you have to an answer.
While traveling through the Second Ring, Dante and Virgil come across a place with many dark trees, but no actual people. They can hear voices screaming in pain, but they can't see them. Virgil tells Dante to break off a twig from one of the trees, after which the tree cries in pain and starts bleeding. Virgil then explains that all of these trees are souls of people who've hurt themselves during life, those who have willingly discarded their own bodies and committed suicide. Thus whenever the tree is hurt (a branch broken off), they feel pain as if they were dismembered.
