The correct answer is "The solution is immiscible". 
A solution is said to be immisicible when two or more substance do not mix in each other to form a homogeneous solution. 
However, a misicible solution is one where two or more substances mix in each other to form a homogeneous solution. 
In an unsaturated solution more solute can still dissolve in the solvent to form a solution. However, in this case more powdered juice mix does not dissolve in the water.