math Geniuses! I need your help!

At 6 a.m., the temperature is 19.4°C. Between 6 a.m. and noon, the temperature rises 3.8°C. Between noon and 6 p.m., the temperature falls 2.5°C.

How much greater is the temperature at 6 p.m. than it was at 6 a.m.?

Your answer choices:

1.3°C

6.3°C

13.1°C

20.7°C