Answer: B. By giving a specific example of a tragedy caused by indifference
Explanation:
Logos is referred to as an appeal to logic and a way by which the audience can be persuaded with reason, through the use of facts and figures when crafting a persuasive writing.
Wiesel is establishing logos in this passage by giving a specific example of a tragedy caused by indifference. In this case, by giving a example of indifference, Wiesel is giving further information to persuade the audience.