Final answer:
The correct objects for the problem domain of student registration are students, courses, instructors, sections, and classrooms as they are directly involved in the class registration process.
Step-by-step explanation:
The objects for the problem domain of student registration most relevant to the process are students, courses, instructors, sections, and classrooms. These are the elements that typically interact when a student registers for classes in an educational institution. They represent the core aspects of the system required for its operation - students need to register for courses which are taught by instructors, held in classrooms, and are organized into sections to manage class sizes and schedules.