Which angles are right?

A. angle KLJ

B. angle MLK

D. angle EFH

All three angles mentioned have a tiny square marker to visually show the reader that the angle is a right angle, aka 90 degree angle. We can say that the segments forming the angle are perpendicular segments.

For angle GFE, it is smaller than angle EFH because point G is between or inside the angle EFH. So there is no way that angle GFE is a right angle.