Which of the Following Describes the Skeleton of a Dinoflagellate

Which of the following describes the skeleton of a dinoflagellate?

A) An elaborate array of trumpet-shaped calcium carbonate plates, forming a sphere.
B) A multichambered shell made of organic material hardened with calcium carbonate. The spirally arranged chambers have many tiny pores.
C) Spherical, with a distinctive equatorial constriction. The surface is covered by a complex pattern of projecting ridges, reinforced by internal plates of cellulose.
D) Long slender radial projections with scales of silica.
E) A pair of glass-like valves that fit together like the two halves of a Petri dish. The surface is highly ornamented with pores and spines.