What similarity statement can you write relating the three triangles in the diagram?

The answer is A. The three given triangles in A all have a right angle, IGH, FGH, and IHF. Angle I+angle GHI=90, GHI+GHF=90, so angle I=angle GHF; therefore, the three triangles all share a smaller acute angle. According to AA, the three triangles are similar.

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C, e, and a (hope it )