Consider separate solutions of $0.500\; M\; C_2H_5OH(aq),\; 0.100\; M \;Mg_3(PO_4)_2(aq),\; 0.250\; M\; KBr(aq)$ and $0.125 \;M \;Na_3PO_4(aq)$ at $25^{\circ}C$. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

Question

( A ) $0.100 \;M \;Mg_3(PO_4)_2(aq)$ has the highest osmotic pressure.
( B ) $0.500\; M \;C_2H_5OH(aq)$ has the highest osmotic pressure.
( C ) $0.125\; M \;Na_3PO_4(aq)$ has the highest osmotic pressure.
( D ) They all have the same osmotic pressure.