What is the primary role of a jammer in roller derby?

The primary role of a jammer in roller derby is to score points for their team. Jammers are unique players who wear a designated helmet cover with a star on it, distinguishing them from other skaters. Once the jam begins, the jammer's objective is to lap the opposing team’s blockers and ultimately skate past them to score points. Each time the jammer successfully passes a blocker from the opposing team, they earn points for their team. This scoring element is fundamental to the game and is what ultimately contributes to the team's success.

While other roles, such as defending and calling off the jam, are important in the context of gameplay, they do not define the primary responsibilities of the jammer. Instead, those aspects relate more closely to the roles of blockers or the strategies used during gameplay. The core focus for any jammer is to maximize scoring opportunities, making option B the most accurate representation of their role.