Answer:
The measure of angle CED is m and option 1 is correct.
Explanation:
In triangle ABC and EDC,
(Given)
(C is common vertex)
By AA property of similarity,

If two triangles are similar, then their corresponding angles are same and the corresponding sides are proportional.
Since triangle ABC is similar to triangle EDC, therefore


Therefore the measure of angle CED is m. Option 1 is correct.