The blue color of the solution (metal dissolved in liquid ammonia), if the solution above is concentrated, then :

The blue color of the solution (metal dissolved in liquid ammonia), if the solution above is concentrated, then blue color changes to bronze color.

When light shines on the solution, the ammoniated electrons become activated by absorbing red light's energy, and blue light is transferred instead. This gives the solution a blue tint. Bronze becomes the color of the solution when it is concentrated.

Hence, option B is correct.