The correct option is
C Some of the chordate characters
A tunicate is an invertebrate animal. They are marine organisms. The adult form of this organisms are sessile. They remain attached to rocks or other hard surfaces on the ocean floor. This substratum provides place to attach and grow. These are very simple organisms. The adult form is very different when compared to the larval stage. They have close relationship to the chordates. This relationship is considered due to the active and mobile larval stage. The larvae possess a notchord and resembles a tadpole. The larvae have more advanced features which helps in swimming and searching for food. Thus, the correct answer is option C.