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 angle ade is 36°. the following flowchart with missing statements and reasons proves that the measure of angle ecb is 54°: which statement and reason can be used to fill in the numbered blank spaces?

a. measure of angle aed is 36°
base angle theorem
corresponding angles are congruent
b. measure of angle aed is 54°
base angle theorem
alternate interior angles are congruent
c. measure of angle aed is 54°
triangle sum theorem
alternate interior angles are congruent
d. measure of angle aed is 54°
triangle sum theorem
corresponding angle are congruent