Final answer:
A regular hexagonal pyramid has six planes of symmetry.
Step-by-step explanation:
A regular hexagonal pyramid is a solid shape with a hexagonal base and triangular faces that meet at a common vertex. To determine the number of planes of symmetry it has, we can consider the symmetry of the shape. Each face of the hexagonal base can be divided into two congruent halves by a plane passing through its center. Additionally, each triangular face meeting at the vertex can also be divided into two congruent halves. Since there are six triangular faces, there will be six planes of symmetry that pass through the vertex and the center of each face. Therefore, the answer is a. six.