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AwesomeMochi
Answer: The third one.

Look at the slope for the segment 0-2. This is the only graph that has a negative slope, meaning that it has a negative rate of change. 
mreijepatmat
The 3rd parabola has a negative rate of change: You notice than within the interval [0 , 20] the curve is "going down"
Whereas the 4th parabola's rate:
it's negative between [0 and 1.5] and positive starting 1.5 and up

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