Final answer:
A. Construction Y because point E is the circumcenter of triangle LMN. Construction Y should be used because point E is the circumcenter of triangle LMN.
Step-by-step explanation:
The best location of the school can be found by constructing the incenter or circumcenter of triangle LMN.
To find the incenter, construction X should be used because point C is the incenter. The incenter is the point where the angle bisectors of a triangle intersect. It is equidistant from all three sides of the triangle.
To find the circumcenter, construction Y should be used because point E is the circumcenter. The circumcenter is the point where the perpendicular bisectors of a triangle intersect. It is equidistant from all three vertices of the triangle.
Therefore, the correct construction for finding the best location of the school is:
A. Construction Y because point E is the circumcenter of triangle LMN