A schematic representation of a chordate’s embryo is shown in the above figure :
Which of the following represents A, B, C and D respectively?

The correct option is D Post anal part, notochord, nerve cord and gill slits
The given figure shows the internal organization of a chordate.
Following is the labelling of the given figure:
(A)- It possess a post-anal tail.
(B)- It possess notochord either during the early embryonic stage or throughout life.
(C)-The notochord lies ventral to nerve cord
(D)- Paired pharyngeal gill slits

So, the correct answer is option-d.