○=> Correct option :
[tex]\color{plum}\tt\bold{(D) \: 70}[/tex]
○=> Steps to derive correct option :
Angle 1 and angle 3 are vertically opposite angles.
We know that :
▪︎ Vertically opposite angles are always equal.
Which means :
Angle 1 = Angle 3
Thus, the measure of angle 3 = 70°
▪︎Therefore, the correct option is (D) 70
