In a two-dimensional work of art that is balanced symmetrically, the implied center of gravity is

The correct answer is "a long the vertical axis down towards, the middle of the artwork". The artwork must have proper balance in each side, in order for it to be considered symmetrically balanced. Being symmetrically balanced, refers to the composition wherein whatever happens on the left side of the composition, the right must also has the same one, for it to become balanced.