To determine whether either object has a constant velocity, we need to analyze the characteristics of the graphs given.
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Object C: The graph is concave up and slopes upward to the point (6, 32). A concave up curve indicates that the velocity is changing; specifically, the object is accelerating. Therefore, object C does not have a constant velocity.
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Object D: The dashed line slopes upward from the origin to the point (6, 25). Because this is a straight line, it indicates a uniform motion with a constant slope. Thus, object D has a constant velocity.
Based on this analysis, the correct response is:
Only object D has a constant velocity.