Final answer:
The author of 'The Perils of Indifference' develops his thesis or arguments by strongly stating opinion.
Step-by-step explanation:
From the passage titled 'The Perils of Indifference' by Elie Wiesel, the author develops his thesis or arguments by providing strong statements and supporting evidence. Wiesel does not simply state opinions, describe his childhood experience, or describe mountains. Instead, he presents his main point without delay and supports it with examples and reasoning. Therefore, the best answer is option a) He strongly states opinion.