The substitute teacher must accept the _________ for classroom discipline.

The correct choice is that the substitute teacher must accept the primary responsibility for classroom discipline. This reflects the overarching role a substitute teacher has in maintaining a conducive learning environment. When a regular teacher is absent, the substitute steps in to manage the classroom, ensuring that students remain engaged, focused, and adhere to established behavioral expectations. This responsibility is crucial as it directly impacts the students' educational experience and helps maintain order in the absence of the regular teacher.

Accepting primary responsibility means that the substitute teacher is the main authority figure in the classroom and must make decisions that promote discipline and respect. This includes implementing classroom rules and strategies to handle any behavioral issues that arise. It is essential for effective teaching and learning to continue during the substitute's tenure in the classroom, thus underscoring the necessity of taking on primary responsibility for discipline.

Other responsibilities, such as shared or administrative duties, do not adequately convey the level of authority and accountability that a substitute teacher must adopt for managing classroom behavior effectively.