Cho hình vẽ, Biết a|| b, góc C2 - góc A2 = 30 độ

A. $\widehat{A_1}={115}^o;\widehat{C_1}={85}^o$

B. $\widehat{A_1}={85}^o;\widehat{C_1}={115}^o$

C. $\widehat{A_1}={105}^o;\widehat{C_1}={75}^o$

D. $\widehat{A_1}={75}^o;\widehat{C_1}={105}^o$