The correct option is
A Calcarea
Sycon or Scypha is commonly called as urn sponge or crown sponge. It is a marine sponge belonging to class Calcarea, which possess a vase shaped, radially symmetrical body. The canal system is of syconoid type. Reproduction is both asexual and sexual type. The larval stage is called amphiblastula as the micromeres have flagella and is a freely swimming stage until it settles down and undergoes gastrulation.
So, the correct answer is 'Calcarea'.