Hi! Answer A is not saying "if melt!" The LSAT makers are trying to trick you. Answer A is saying "IF a snowflake is in a warm place AND it is not protected by insulation, THEN snowflake will melt." In the stimulus, the conjuction (the "and") is in the necessary condition and in answer choice A, the conjunction is in the sufficient condition. This is why they do not use the same method of reasoning. Answer A switches the placement of the conjuction. I hope that helped! Remember what comes after the "if" is the SUFFICIENT condition.

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