SAT US History Practice Question

In the "Letter from Birmingham Jail," Martin Luther King Jr. discussed the "strangely irrational notion that there is something in the flow of time that inevitably cures all ills. We must come to see that human progress never rolls on the wheels of inevitability." Which of the following represents the main idea of the above excerpt?

1. A.Nonviolence is the key to success for the civil rights movement.
2. B.The white moderates are obstacles to our victory.
3. C.We must act now.
4. D.Injustice must be eradicated everywhere.
5. E.Breaking unjust laws is justified.