Final answer:
The sentence that best supports the answer is 'There comes a time when the cup of endurance runs over, and men are no longer willing to be plunged into the abyss of despair,' as it conveys the urgent need for change due to the severe effects of segregation.
Step-by-step explanation:
The best sentence to support the correct answer to Question 7 would be one that encapsulates the hardships or emotions related to the experience of segregation and the urgency for change. Taking into account the context provided and the expressions used that convey a sense of impatience and need for immediate action, the sentence that best supports this is:
B. "There comes a time when the cup of endurance runs over, and men are no longer willing to be plunged into the abyss of despair."
This sentence from the provided passages strongly emphasizes the critical point of tolerance being exceeded and the desperation for improvement in conditions, which aligns with the sense of urgency and unwillingness to accept further deferral of rights and justice.