These are stage directions (A). As you probably know, The Importance of being Earnest is a play. This scene is not one that would be read out to the audience, it is what the audience would see on stage, ie stage directions. Since you are reading the play's script and cannot see the action on stage, stage directions have been provided for you in your text.
Answer:
D) It's stories contain a flawed hero.
Explanation:
The correct answer is that he is D. indicating what happens to tribes that don't unite against the whites.
We know this because immediately afterwards he is answering his question: "They have vanished before the avarice[greed] and oppression of the white men" - so he says that this might also happen to the others.
