Take into account similar triangles.
Consider that angle 1 is a right angle. Then:
m∠1 = 90°
the angle below the angle of 50° is congruent to it, then, the angle is 50°.
To determine the measure of angle 2, consider that the sum of the interior angles of a triangle is equal to 180°:
50 + 90 + m∠2 = 180°
m∠2 = 180° - 50° - 90°
m∠2 = 40°
Angle 3 is also a right angle, then:
m∠3 = 90°
Hence, the measure of the required angles are:
D) 90, 40, 90