Which of the following correctly describes the FX full turn element?

The full turn element in floor exercise is defined by the gymnast executing a complete 360-degree rotation while maintaining a specific leg position. When a gymnast performs a full turn with the leg at horizontal, it indicates that the leg is ideally positioned parallel to the floor as the gymnast rotates. This position not only demonstrates control and balance but also shows the gymnast's ability to execute a turn with a degree of elegance and mastery.

Having the leg at horizontal during a full turn is a standard expectation in judging, as it highlights both the technical skill and artistic presentation of the routine. This position allows the judges to recognize the gymnast's skill level and adherence to the requirements of the element. Therefore, option B accurately captures the essence of the full turn element in gymnastics.