Recognise the figure : 

The animal belongs to : 

Tunicata

The correct answer is Option (2) -Tunicata

Phylum Chordata is divided into three subphyla: Urochordata or Tunicata, Cephalochordata and Vertebrata .

Subphyla Urochordata and Cephalochordata are often referred to as protochordates and are exclusively marine.

In Urochordata, notochord is present only in larval tail, while in Cephalochordata, it extends from head to tail region and is persistent throughout their life.

Examples: Urochordata – Ascidia, Salpa, Doliolum; Cephalochordata – Branchiostoma (Amphioxus or Lancelet).

              Ascidia