The zoological name of ‘sea lily’ is

The common name of Antedon is sea lily. They are known as stemless crinoids. They can swim freely in the water. They have five pairs of arms. The arms are feather like structures. They have cirri which are unbranched appendages on the central disc like structure. There is presence of mouth on the upper surface. There are ambulacral grooves present on the upper side of the organism. 

Hence the correct answer is option B.