In a quadrilateral PQRS, the angles P, Q, R and S are in the ratio \[\mathbf{1}:\mathbf{2}:\mathbf{3}:\mathbf{4}\]. Find the measure of the angle R.

• A. \[36{}^\circ \]                    
• B.                    \[72{}^\circ \]
• C. \[108{}^\circ \]   
• D.        \[144{}^\circ \]
• E. None of these