Without seeing the actual graph, I cannot provide an accurate answer. However, I can help you interpret the options based on typical graph analysis.
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First the speed decreases, then it increases. - This option suggests that the speed is initially going down and then goes back up.
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The speed shown on this graph begins to decrease at the 2-second mark. - This option indicates that at 2 seconds, the speed starts to drop.
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First the speed increases, then it decreases. - This option suggests that the speed rises initially and then falls off later.
If you can describe the graph or provide more details about it, I can help determine which option is correct.