B is the correct answer.
Social inequality is one of those hard problems where one has to compare an apple with a kiwi.
Both are fruit and both have problems, but how do you use the same language and metrics to compare two very different fruits?
The issue is that what might be a problem for the Kiwi might be normal for the Apple, or not problematic.
The Declaration of Independence was written to justify the American colonies' break from Great Britain and to make it easier to gain international support from potential allies. It enumerated the rights of man and the grievances the colonists had against British rule.
In the seminal and terribly decided case of Plessy v. Ferguson, the Supreme Court determined that the separation of the races was permissible as long as the separate accommodations was separate but equal.
While this was nonsense in practice, it was the fiction that the Court hid behind.
Well surely 1, 2 and 4 are true, e.g, it was once thought that earth was the centre of the universe, this was revised and rejected. Scientists are still researching the existence of the universe using more advanced technology to test old theories. There are also new phenomena in which cannot be explained but there are theories to suggest why. But 3 is completely wrong as they are not treated as facts but a prediction until proven.