How is the arm position described during the travelling balance movement?

The correct choice highlights the dynamic nature of the arm positions during the travelling balance movement in Scottish Highland dance. As the dancer performs this movement, the arms alternately move between the 5th position (where the arms are rounded and held high) and the 3rd position (where one arm is raised and the other is in a lower position, usually crossing the body). This alternating dynamic not only adds visual appeal but also plays a vital role in the dancer's balance and poise, allowing them to maintain a graceful line and transition fluidly between movements.

The use of both arm positions contributes to a sense of movement and rhythm, effectively matching the intricacies of the footwork involved in the travelling balance. This flexibility in arm placement contrasts with other choices which do not accurately reflect the technique required in this specific movement. For instance, holding arms in 4th or raised above the head would limit the necessary fluidity and connection to the ground that defines the travelling balance movement, while having arms parallel to the body deviates from the traditional aesthetic and formality of Highland dance.