Question

which part of the room is coolest according to the thermal image? the walls around the windows the windows and their frames the radiators under the windows

Explanation:

Thermal images use color to represent temperature. Cooler areas are shown in cooler colors (like blue - purple). In the thermal image, the windows and their frames are likely to be the coolest part as they are shown in the cooler color range compared to the walls around the windows (which might be warmer due to less heat loss) and the radiators (which are heat - emitting sources).

Answer:

the windows and their frames