Cho hình vẽ sau:

Câu hỏi:  Cho hình vẽ sau:Biết $\widehat{{{B}_{4}}}={{60}^{0}}$  Tính $\widehat{{{B}_{1}}},\widehat{{{B}_{2}}},\widehat{{{B}_{3}}}$  

A $\widehat{{{B}_{2}}}={{60}^{0}},\,\widehat{{{B}_{1}}}=\widehat{{{B}_{3}}}={{120}^{0}}$                                 

B $\widehat{{{B}_{1}}}={{60}^{0}},\,\widehat{{{B}_{2}}}=\widehat{{{B}_{3}}}={{120}^{0}}$                                

C $\widehat{{{B}_{3}}}={{60}^{0}},\,\widehat{{{B}_{1}}}=\widehat{{{B}_{2}}}={{120}^{0}}$                                    

D $\widehat{{{B}_{2}}}={{60}^{0}},\,\widehat{{{B}_{1}}}=\widehat{{{B}_{3}}}={{110}^{0}}$