Which of the following is a feature of linear elements?

Linear elements in synchro skating refer to formations that move in a straight line along the ice. The defining feature of these elements is their linearity and the consistent movement in one direction, which is crucial for maintaining the flow and cohesion of the team.

The presence of jumps or throw jumps in a linear element indicates the technical and artistic challenge that the skaters must execute while still adhering to the linear pattern. Jumps in this context are performed while maintaining the linear formation, showcasing not only the individual skater's skills but also how well they coordinate with others to stay aligned during such dynamic movements.

In contrast, the other options represent different aspects or styles of skating. Change of rotational direction involves a shift in the direction of rotation, which is not a characteristic of linear elements. Interlocking elements include the skaters intertwining or crossing over each other's paths, which adds complexity that diverges from a purely linear formation. Weaving involves a pattern where skaters move in and out of each other, which again is a deviation from the simplicity of linearity. Therefore, jumps or throw jumps are the definitive traits that align with the theme of linear elements in synchro skating.