This question tests basic French vocabulary by asking which of the given words is a colour (une couleur).
Rouge means red and is the only colour among the options. The other words belong to entirely different categories:
chaise means chair (a piece of furniture)
temps means time or weather
bois means wood (a material) or forest
In French, the basic colours to know include rouge (red), bleu (blue), vert (green), jaune (yellow), blanc (white), noir (black), orange, and violet (purple).
