Answer:
The correct answer option is A. a cat.
Step-by-step explanation:
From the given options, a cat is an animal which exhibits a notochord at some stage in its development.
Cats, being a mammal, have backbones which puts them in the category of phylum Chordata and the subphylum Vertebrata. The chordates, unlike the members of other phyla, have a notochord which is formed during some stage of their development to support the body.