Observe the given figure. If \[\angle b={{62}^{o}}\] and\[\angle c={{77}^{o}}\], find\[\angle a\].

• A. \[{{39}^{o}}\]                        
• B. \[{{141}^{o}}\]                      
• C. \[{{41}^{o}}\]            
• D.        \[{{139}^{o}}\]