If angle A B C and angle C B D form a linear pair, which of the following statements about the angles must be true?

angle A B C and angle C B D are complementary.
angle A B C and angle C B D are complementary to the same angle.
angle A B C and angle C B D are supplementary.
angle A B C and angle C B D are supplementary to the same angle

angle A B C and angle C B D are supplementary.

If angle ABC and angle CBD form a linear pair, which means they are adjacent angles whose sum is equal to 180 degrees, then the correct statement about the angles is:

angle ABC and angle CBD are supplementary.