In Geometry class, Taryn presented a counterexample to disprove a conjecture
written on the board. The counterexample Taryn gave is shown.
An isosceles triangle has two congruent angles and two congruent sides.
Which conjecture is disproved by Taryn's counterexample?

A. If a polygon is regular, all angles will be congruent and all sides will be
congruent.
B. One angle in an isosceles triangle is always obtuse.
C. The number of congruent sides in a triangle determines the number of congruent
angles.
D. If a polygon is not regular, the polygon will not have any congruent angles or
congruent sides.