Relative decrease in vapour pressure of an aqueous glucose dilute solution is found to be 0.018.What is the elevation in boiling point? (Given 1 molal aq.glucose solution boils at 100.62$^{\large\circ}C$ at 1 atm.pressure)

Question

$\begin{array}{1 1}(a)\;0.12^{\large\circ}C\\(b)\;0.62^{\large\circ}C\\(c)\;0.26^{\large\circ}C\\(d)\;0.21^{\large\circ}C\end{array}$