Cho hình vẽ sau, biết a || b, góc A1 - góc C1= 40 độ

A. $\widehat{A_2}={80}^o,\widehat{C_2}={110}^o$

B. $\widehat{A_2}={110}^o,\widehat{C_2}={70}^o$

C. $\widehat{A_2}={70}^o,\widehat{C_2}={110}^o$

D. $\widehat{A_2}={70}^o,\widehat{C_2}={70}^o$