Brittany was tracking the increasing temperature in the morning. At 8 a.m., it was 68 degrees Fahrenheit. At 10 a.m., it was 74 degrees Fahrenheit. If Brittany made the function f(x) = 3x + 36, what would the 36 represent?
A. The temperature at midnight
B. The rate the temperature was increasing
C. The length of time she recorded for
D.The total change in degrees