Can anyone take the time to help me please.

 Which is this?

A) Angle of Elevation

B) 45-45-90 Triangle Theorem

C) Geometric Mean (Altitude) Theorem

D) 30-60-90 Triangle Theorem

E) Geometric Mean

F) Converse of The Pythagorean

G) Cosine Ration

H) Angle of depression

I) Area of the triangle