B. Apartheid
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If one doesn't know how they are being traced, it could lead to various forms of distress and unrest. Take for example, the anxious person who enjoys baking. If they were anxious because they didn't know how they were being traced, they might start thinking their whisk was being used to trace them. This may then put the off baking altogether.
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If the reaction causes the same answer every time
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Self-interest, rightly understood, is a strong force for good in our society, as what benefits one person often benefits the entire community, or even society, at-large. ... This would include education, national defense and an internal national mechanism to protect people from others in society who might prey on them