Answer:
C. ∠AEC measures 90°
Explanation:
The given information describes a horizontal line with points A, E, and D. A vertical line extends from point E to point C and forms a right angle at CED. A line extends up and to the left from point E to point B. The statement that is true about the given information is that ∠AEC measures 90° 1. Therefore, the correct answer is C. ∠AEC measures 90°.