Which statement describes the order of rotational symmetry for an isosceles triangle?
A. An isosceles triangle has an order 0 rotational symmetry because there is no angle at which it can be rotated onto itself
B. An isosceles triangle has an order 1 rotational symmetry because it does not have all congruent angles
C. An isosceles triangle has an order 2 rotational symmetry because it has 1 pair of congruent angles.
D. An isosceles triangle has an order 3 rotational symmetry because it has 3 angles.