ANSWER
D. The interquartile range (IQR) for town A, 15°, is less than the IQR for town B, 20°.
Step-by-step explanation
The interquartile range is the difference between the third and first quartiles,

The IQR for the temperatures of town A is,

And for the temperatures of town B is,

Hence, the IQR for town A is 15°, and it is less than the IQR for town B, which is 20°.