X-marrow; Y-spongy are the structures of the bone are indicated by the arrows.
What is a Bone?
This is a rigid structure which forms the main components of the skeleton in most organisms.
The X-marrow has a lot of blood vessels present while the Y-spongy contains osteocytes thereby making option B the most appropriate choice.
Read more about Bone here https://brainly.com/question/26323655
