In the figure, PQR, PUS, STW and QUTV are straight line. If PR // WS, QV // RS, \[\angle QPU={{60}^{O}}\] and \[\angle VTW={{70}^{O}},\] find \[\angle PRS.\]

• A.  \[{{110}^{o}}\]                  
• B.  \[{{80}^{o}}\]                    
• C.  \[{{87}^{o}}\]                    
• D.       \[{{70}^{o}}\]