Answer:
B. triangular pyramid.
Step-by-step explanation:
-Octahedron has eight faces that are equilateral triangles, six vertices and twelve edges.
-Triangular pyramid has four triangular faces that have congruent isosceles triangles in which one of them is considered the base.
-Right triangular pyramid has a triangle base, three faces and six edges and the line that is located between the centre of the base and the vertex is perpendicular to the base.
-Regular rectangular prism has twelve sides, 8 vertices and six rectangular faces.
According to this, the answer is triangular pyramid.
