Answer:
Among the options given on the question the correct answer is option C.
It emphasizes the point that Xury is Crusoe's property and Crusoe
can do with him as he pleases.
Explanation: Xury is character in the Adventure of Robinson Crusoe. Xury was the boy who escaped with Robinson Crusoe from the capture of the Africa. Then he was faithful and helpful to Robinson Crusoe. But the matter of fact is the non white European face of Xury has always thought subordinate to the Crusoe. Crusoe has seen as the master of the Xury.
However when the Portuguese captain had rescued Crusoe, the captain demanded the boy Xury for him and he offered money to Crusoe for the boy. But Crusoe was not willing to take the money for him. Because he didn't want sell him, but the captain thought he was buying a boy from his master.
So the phrase 'sell the poor boy's liberty ' indicates that Xury is the property of Crusoe.