The correct answer here is the last option.
The purpose of the Declaration of Independence in general is used to announce the rejection of the British rule, but this excerpt in particular is used to show that the thirteen colonies have every right to rebel against the King as he does not have the best interests of the colonies in mind. So they are completely justified in renouncing his rule.
Ummm....Definitely not....The 14th and 15th amendments did. But it wasn't just African Americans....
The answer is probably c or d