Question

hollow space inside the diaphysis, filled with yellow marrow
medullary cavity
distal epiphysis
red marrow
endosteum

Explanation:

The medullary cavity is the hollow space within the diaphysis of a long - bone and is filled with yellow marrow. Red marrow is involved in blood cell production and is not the space itself. The distal epiphysis is the end part of the bone. The endosteum is a membrane lining the inner surface of bones.

Answer:

Medullary Cavity