Four containers are taken at the same temperature, as shown in the figure :

 

 

 

 

 

 

 

(a) $500 \mathrm{mL}$ of  $10\%(/\mathrm{W})$ urea solution

(b) $500 \mathrm{mL}$ of  $10\mathrm{\%}(w/w)$ urea solution

(c) $400 \mathrm{mL}$ of $10\mathrm{\%}(w/w)$ urea solution

(d) $500 \mathrm{mL}$ of $20\mathrm{\%}(w/w)$ urea solution

The correct order of vapour pressure of these solution is: