Final answer:
The primary difference between a tutor and a teacher is that tutors provide individualized one-on-one assistance, while teachers address large groups of students in a classroom setting.
Step-by-step explanation:
Understanding the key differences between a tutor and a teacher is essential for recognizing their distinct roles in education. The most correct answer to the differences between a tutor and a teacher from the given options is B) Tutors provide one-on-one assistance, while teachers instruct large groups. This statement reflects the individualized approach that tutors usually offer, tailoring their support to the specific needs of a student. In contrast, teachers typically work in a classroom setting where they present information to many students at once, adhering to regulated curriculums. Furthermore, it's also important to address some misconceptions in the other options. Tutors may or may not focus on theoretical concepts—this largely depends on the subject and the needs of the student. They do not usually follow a strict curriculum as they are often tailoring their lessons to the individual student's needs. Lastly, tutors are generally less involved in official grading compared to teachers; they focus more on helping students understand concepts and develop skills that can lead to improved academic performance.