To an observer stationary on a plateform a compared to a stationary clock and a moving clock clicks:

Explanation

The correct answer is that the moving clock ticks slower as observed from a stationary platform. This phenomenon is explained by the theory of relativity, specifically time dilation, which states that a clock moving relative to an observer will measure time more slowly than a clock at rest with respect to that observer. Option B is incorrect because relativity does not allow for a moving clock to tick faster. Option C is incorrect because it contradicts the experimental and theoretical background of time dilation. Option D is incorrect because time cannot be negative, as time is always a positive measure moving forward.