To determine whether either object has a constant velocity, we need to examine their position-time graphs.
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Object C has a concave up graph, indicating that its slope (which represents velocity) is changing over time. Therefore, the velocity is not constant.
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Object D is represented by a straight dashed line, which means the slope of this line is consistent throughout its length. This indicates that object D has a constant velocity.
Based on this analysis, the correct response is:
Only object D has a constant velocity.