Last Monday, the temperature at 3 a.m. in a North Dakota town was −27°C. At 3 p.m., the temperature was −18°C. Which of the following is true about the temperature change between 3 a.m. and 3 p.m.?

The temperature change between 3 a.m. and 3 p.m. in the North Dakota town is an increase of 9°C.