Which triangle is similar to ABC?

The triangle ΔABC and triangle A will be similar. Then the correct option is A.
A triangle is a three-sided polygon with three angles. The angles of the triangle add up to 180 degrees.
The triangle ΔABC is sown.
Then the angles of the triangle ΔABC will be
∠A = 180° - 126° = 54°
∠B = 61°
∠C = 180° - 54° - 61° = 65°
If any two angles of the triangle are similar to any two angles of the triangle ΔABC. Then the triangles will be similar.
The triangle ΔABC and triangle A will be similar.
Then the correct option is A.
More about the triangle link is given below.
https://brainly.com/question/25813512
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