The correct option is C Loricifera
Loricifera is the most recently reported phylum. It is a phylum of very small to microscopic animals which are sediment-dwellers. They are characterized by a protective outer case called lorica and their habitat, which is in the spaces between marine gravel to which they attach themselves. The phylum was discovered in 1983 by Reinhardt Kristensen, in Roscoff, France.
So, the correct answer is option C.