The following table represents the altitude of a hiker climbing in Mountain over a 60 minute hike. Calculate the average rate of change over the interval from 0 to 30 minutes.
A: The rate of change is about 90 feet per minute.
B: The rate of change is about 3 feet per minute.
C: The rate of change is about 2 feet per minute.
D: The rate of change is about 30 feet per minute.
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