Jenna created a scatter plot and drew a line of best fit, as shown. 18
-16
-14
-12
-10
8
-6
8
10
12
14:16
18.2

The equation which describes the indirect variation of hours and the temperature is, 
                                           h = k / t
where k is the constant of proportionality.
Substituting the known values to the given equation above, 
                                          3 hours = k / 60 degrees
Solving for k gives an answer of 180. Thus the answer is letter b. 180. Note that in the choices, letter b is written after letter c.