In ___________ balance, a high vertical line on one side is counterbalanced by a low horizontal line on the other side.

In asymmetrical balance, elements on either side of a composition are not identical but are arranged in a way that achieves visual equilibrium. Specifically, in the case described, a high vertical line on one side counters a low horizontal line on the opposite side. This creates an engaging contrast that draws the viewer's eye while maintaining a sense of stability. Asymmetrical balance is often used to create a more dynamic and interesting composition compared to symmetrical balance, where elements are mirror images on either side of an axis.

While symmetrical balance involves mirroring shapes and forms to create harmony, asymmetrical balance relies on different weights (such as size, shape, color, and texture) to achieve equilibrium. Radial balance, on the other hand, involves elements radiating out from a central point and is commonly seen in designs like mandalas. Formal balance typically refers to a more structured and organized arrangement that aligns closely with symmetrical principles. Thus, the emphasis on contrasting elements achieving balance without direct mirroring is what makes asymmetrical balance the correct choice here.