In the given figure, PQ is a diameter of a circle with centre O and PQRS is a cyclic quadrilateral. SQ is joined. If\[{{240}^{o}}\], find\[{{60}^{o}}\].

• A.  \[{{120}^{o}}\]                              
• B.  \[{{180}^{o}}\]
• C.  \[\angle R={{138}^{o}}\]                
• D.  \[\angle PQS\]