In the given figure, rays OS and OT are angle bisectors of \[\angle POQ\] and \[\angle POR\]respectively. What is the measure of\[\angle SOT\].

• A.  \[60{}^\circ \]                      
• B.  \[70{}^\circ \]           
• C.  \[80{}^\circ \]                      
• D.  \[90{}^\circ \]