A teacher has students make sundials and observe them several × throughout the same school day. Which of the following concepts does this activity best demonstrate?

While this statement is true, it does not directly relate to the specific observation of sundials throughout the day. The activity focuses on the continuous change in the Sun's position rather than just the events of sunrise and sunset, which occur at specific times.

This choice addresses the mass of the Sun, which is indeed a fact about its role in the solar system. However, it does not pertain to the observable phenomenon of the Sun's position changing throughout the day, which is the core focus of the sundial activity.

This statement refers to the tilt of Earth's axis and its impact on seasons and solar energy distribution. While relevant to solar dynamics, it does not explain the daily variation in the Sun's position as observed with sundials, which is more about rotation rather than axial tilt.