Correct Answer: Hemichordata

Solution : The correct option is Hemichordata.

Hemichordata is not a subgroup of the plant kingdom; it is a phylum within the animal kingdom. Hemichordates are marine organisms that share some characteristics with both chordates. These are generally burrowing animals found in marine environments. They have a proboscis, collar, and trunk region, and they are named for the acorn-shaped proboscis.