What figure is being constructed below? A. a perpendicular bisector
B. a congruent segment
C. an angle bisector
D. a congruent angle

A or C. Here are some definitions

Step-by-step explanation:

A= A line which cuts a line segment into two equal parts at 90°. Try this Drag one of the orange dots at A or B and note the the line AB always divides the segment PQ into two equal parts. When it is exactly at right angles to PQ it is called the perpendicular bisector.

B=Congruent segments are segments that have the same length. ≅ Points that lie on the same line are called collinear. A theorem is a mathematical statement that can be proved. The midpoint of a segment is a point that divides the segment into two congruent segments

C=In geometry, the angle bisector theorem is concerned with the relative lengths of the two segments that a triangle's side is divided into by a line that bisects the opposite angle. It equates their relative lengths to the relative lengths of the other two sides of the triangle. 

D=Congruent angles are angles with exactly the same measure. Example: In the figure shown, ∠A is congruent to ∠B ; they both measure 45° . Congruence of angles in shown in figures by marking the angles with the same number of small arcs near the vertex

hope this helps : )