The temperature (in degrees Celsius) as a function of time (in hours since noon) for a certain day in San Jose, Costa Rica, is graphed. What is the approximate average rate at which the temperature decreases between 3:30pm and 8:30pm A)0.8 degrees Celsius per hour B)1 degrees Celsius per hour C)1.2 degrees Celsius per hour D)1.4 degrees Celsius per hour