Answer:
D. Logos, by showing a specific example of the cost of indifference
Step-by-step explanation:
Logos is a way to persuade a reader or an audience on something by means of details, figures, facts, logic or the use of reason. The passage uses this mode of persuasion by showing a specific example (with numbers, dates places, etc.) of the cost of the U.S.'s indifference: Sixty years ago, human cargo of nearly 1,000 Jews was turned back to Nazi Germany, despite all the horrible events that were happening back then (which the author specifies).
All the other options are incorrect because there isn't any rhetorical question in the passage (A), Ethos is a mode of persuasion that uses expert sources or that denotes credibility, expertise or prestige to convince people that the information is reliable, and the excerpt does not mention any source of that kind (B) and Pathos is a way of convincing people on something by appealing to their emotions, not by giving an exact number of something or using facts.