Which topic is most appropriate for developing mathematical reasoning through tessellation activities?

Tessellation activities are best aligned with the concepts of reflections, rotations, and translations because these movements are fundamental to creating and understanding tessellations. The process of tessellation involves repeating shapes that fit together without gaps or overlaps, and this often requires manipulating the shapes through rotation and reflection.

Through activities focused on tessellations, students can explore how shapes can be transformed in a plane to cover a surface entirely. This hands-on approach allows learners to visualize and actively engage with geometric transformations, thereby developing their mathematical reasoning. By experimenting with different shapes and observing how they tessellate through these transformations, students deepen their understanding of symmetry, congruence, and geometric relationships.

While the area of composite figures, similarity and proportional reasoning, and graphs of simple equations are all important mathematical topics, they do not specifically emphasize the transformative properties of shapes in the same way that reflections, rotations, and translations do in the context of tessellation. Consequently, option B is the most appropriate choice for developing mathematical reasoning through tessellation activities.