On a winter day, the temperature at 8 a.m. was -6.8°C. At 2 p.m., the temperature had changed by 10.7°C.

Answer: Option B(points K and M)
Step-by-step explanation:
If -6.8 degrees Celsius was changed by 10.7 Celsius, the result is either 3.9 degrees Celsius or -17.5 degrees Celsius
Answer option B says points K and M, which both look like they could be 3.9 or -17.5 degrees.
Hope this was helpful.