May someone help me with this Question?

A

Step-by-step explanation:

This is because A shows Height/Base = Height/Base. The others are not consistent if you follow the order that the proportion is set up as.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.