Which of the following is true regarding high cuts performed in a series?

High cuts performed in a series allow for slight extensions of the feet, which is essential for maintaining grace and control in this specific movement. The execution of high cuts involves elevating the legs and demonstrating clean footwork, while the slight extension ensures that the dancer maintains proper form and fluidity throughout the series. This subtle extension also contributes to the visual appeal of the performance, highlighting the dancer's technique.

In contrast, the other choices do not accurately reflect the nature of high cuts. For instance, while some movements may require full extensions, high cuts focus more on elevating the feet with a controlled yet elegant approach. Thus, the designation of requiring extensions would be misleading. Similarly, the notion that high cuts must be combined with other movements doesn’t account for their ability to stand alone as significant expressive elements. Finally, while high cuts typically involve some travel or movement across the stage, it's entirely feasible for them to be executed without any travel, particularly in practice settings or specific choreographic choices, thereby making B the most accurate statement regarding high cuts in a series.