For the given question we will check which pair of triangles are similar:
Option A:
Triangles 1 and 2 each have a 36° angle.
So, they are not similar because we need a pair of congruent angles
Option B:
Triangles 3 and 4 each have a 42° angle.
they are not similar as option A
Option C:
Triangle 5 has a 70 angle and a 95° angle. Triangle 6 has a 30° and a 75º.
The triangles are not similar, there are no congruent angles
Option D:
Triangle 7 has a 30 angle and a 90°. Triangle 6 has a 30° and a 60.
The third angle of triangle 7 = 180 - (30+90) = 60
The third angle of triangle 6 = 180 - (30+60) = 90