What is the role of a jammer in roller derby?

The role of a jammer in roller derby is primarily to score points by lapping opposing skaters. The jammer is a crucial position on the team, responsible for navigating through the pack of blockers from both teams and breaking free to earn points. Each time the jammer successfully laps an opposing blocker after legally passing them, they score points for their team. This scoring mechanism is central to the strategy and competitiveness of a roller derby match, as the jammers are often seen as key playmakers who can significantly impact the game's outcome.

The other roles mentioned in the choices do not align with the primary objectives of a jammer. Protecting blockers is typically the responsibility of a blocker who focuses on holding back the opposing jammer while ensuring their own jammer can advance. Sitting in the penalty box is a consequence of foul play and is not an active role in the game. Forming the pack with blockers is also not a function of the jammer, as they are separate from the block formation that aims to assist them in their scoring efforts. Overall, a jam's success largely hinges on the jammer's ability to skillfully maneuver through the opposing team, making the scoring of points by lapping opponents their main task.