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.
                                             
                                          
                                          
                                        
											 
					                  