I'll give you a question, please answer with step-by-step reasoning process.
Sometimes things don't concern people themselves, this often leads them to what about the result?\nOptions:\n- care less\n- talk to each other\n- play golf\n- trip over\n- pay attention

care less
Not being concerned means to not care about something.

If one is not concerned about something, he obviously wouldn't care about its result.

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The answer is care less