Final answer:
The correct option is A. During World War II, Lewis's radio lectures focused on religious beliefs, providing guidance in a time of global distress and uncertainty.
Step-by-step explanation:
At the outbreak of World War II, Lewis was asked to give a series of radio lectures on basic religious beliefs. The correct answer to the given question is A. Religious. During this tumultuous period, societal upheavals and the grim realities of war challenged individuals' faith and philosophical views.
While there were certainly notable advancements in scientific, technological, and political arenas as a direct consequence of the war, Lewis's lectures focused on religious beliefs to provide moral guidance and comfort in a time of global distress and moral ambiguity.