Because that is the moment Douglass finally realized a truth of the white people, especially the white master. They fear that black people would rise against and seize back their freedom if they were to be educated. So while the master may sound cruel this is a awakening moment for Douglass.
I think the correct answers from the choices listed above are the first and the last option. The two disadvantages that the colonies faced in starting a war with england would be that lack of money and equipment and the lack of organization. Hope this answers the question.
