Ichose a but got it wrong..
which statement best explains how this painting shows mood through the subject’s body language?
the use of different shades of blue next to a red table shows the man’s gloom.
the man’s sad facial expression and slumped posture suggest gloom.
the contrast between darkness and light suggests gloom.
the fact that the man is resting his head in his hand shows that he is in a gloomy mood.

The answer is option B "The man’s sad facial expression and slumped posture suggest gloom." Not only the facial expression and slumped postures suggest sadness but the color does too. The shades of blue often mean sadness and emptiness just like how the phrase "Are you feeling blue?" Means are you sad? It wouldn't be option A because the color might show sadness but the table is irrelevant in this picture. It wouldn't be option C because it doesn't compare to two at all based on the mans facial expressions. It also wouldn't be option D because it also doesn't mean he is sad but it does mean he is exhausted or tired.

Hope this helps.