Unfortunately, I don't have enough information to understand why the slope of line D is positive based solely on the description "movement that starts out toward the south, slows down, and stops."
Here's why:
Direction of movement: You mentioned the movement starts towards the south. Southward movement usually corresponds to negative values on a graph (moving down on the y-axis). However, without knowing the context of the graph and its axes, it's impossible to definitively say whether southward movement translates to positive or negative values.
Change in movement: "Slower down" implies a decrease in speed, which could translate to a smaller downward slope (less negative) or even a change to a positive slope if the movement eventually reverses completely and starts going northbound. But just "slowing down" without knowing the final direction doesn't guarantee a positive slope.
Stopping doesn't imply slope: Finally, stopping simply means no further change in position, which doesn't necessarily reflect on the slope itself. The slope represents the rate of change, not the absolute position.
Therefore, to understand why the slope of line D is positive, I need more information about the context, such as:
What does the line represent? (e.g., distance, temperature, speed)
What units are used on the axes? (e.g., meters, degrees Celsius, kilometers per hour)
Can you share a visual representation of the line D? (e.g., a graph or sketch)
With more context, I can help you analyze the movement and the resulting slope
of line D.