To determine which planet should be placed closest to the 50-yard line in a model, it helps to consider the relative sizes of the planets or their distances from the Sun if the model is based on a solar system representation.
Since Earth is often viewed as the reference point for life and the most relatable planet to students, placing it closest to the 50-yard line could make sense in an educational context.
Therefore, the best option for students to put closest to the 50-yard line would be:
A. Earth