Would my answer be correct?

Question

Triangle ABC is a right triangle. Point D is the midpoint of side AB, and point E is the midpoint of side AC. The measure of ∠ADE is 68°.

The proof, with a missing reason, proves that the measure of ∠ECB is 22°.

StatementReason
m∠ADE = 68°	Given
m∠DAE = 90°	Definition of a right angle
m∠AED = 22°	Triangle Sum Theorem
joins the midpoints of  and	Given
is parallel to	?
∠ECB ≅ ∠AED	Corresponding angles are congruent
m∠ECB = 22°	Substitution property

Which of the following can be used to fill in the missing reason?

 Triangle Inequality Theorem 

Midsegment of a Triangle Theorem 

Concurrency of Medians Theorem

 Isosceles Triangle Theorem

I say option 2 but I am not sure, please give me the correct answer

Answer 1

you're correct

that theorem also says DE=AB/2

the drawing is not to scale