Final answer:
The statement about Mrs. Graham being the principal of a high school is true, as the information provided describes her in a leadership role, handling responsibilities typical of a high school principal, such as leading students and implementing policies.
Step-by-step explanation:
The statement “Mrs. Graham serves as the principal of a high school” can be evaluated as true based on the given information. The quoted texts describe a lady principal actively involved with students and administration, suggesting a leadership role in an educational setting. The first quote indicates that she has a commanding role, as she is seen leading a large group of students. The second quote highlights her extensive education and desirable personal qualities, traits that are fitting for a high school principal. Lastly, the third quote mentions the principal addressing a class regarding new attendance policies, indicating her authoritative position within a school.