Which of the following illustrates the difference in scientific understanding between the europeans and the africans? a. "'by the simple exercise of our will we can exert a power for good practically unbounded'…" b. "he was useful because he had been instructed; and what he knew was this—that should the water in that transparent thing disappear, the evil spirit inside the boiler would get angry through the greatness of his thirst, and take a terrible vengeance." c. "they howled, and leaped, and spun, and made horrid faces; but what thrilled you was just the thought of their humanity—like yours—the thought of your remote kinship with this wild and passionate uproar." d. "'can you steer? ' i asked the agent eagerly. he looked very dubious; but i made a grab at his arm, and he understood at once i meant him to steer whether or no."