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On TEAS Reading, identifying the main idea requires distinguishing the overall point from supporting details. The passage centers on protective actions during lightning: seeking proper shelter, avoiding tall isolated trees, and using the “30–30” waiting rule. These specifics function as supporting details that serve a broader purpose—communicating safety guidance to reduce lightning risk. Option B captures that general purpose succinctly. Option A (“fascinating weather phenomenon”) misreads tone; the text is prescriptive, not descriptive or entertaining. Option C isolates one detail (trees) and inflates it to the main idea, a common distractor pattern on TEAS: a strong detail is offered as if it were the central message. Option D is factually incorrect; the passage even notes lightning can strike “miles from rainfall,” directly contradicting the claim that storms “always occur with heavy rain.” For TEAS success, summarize the text in a single sentence in your own words; if your summary resembles a choice, that choice usually reflects the main idea.