As the display reads 25°C. this is the normal average room temperature.
So, the best possible answer is Option C -on her desk
Option a - in the snow is not possible because the display reads 25 degrees. The temperature in snow must have been below zero. Similarly, a glass of water has an average temperature of 10 to 13 degrees. The inner of the mouth has a temperature of 37 degrees or more.
Hence, option C is the answer.