Answer
d.
Work Step by Step
Option a. is incorrect. The cavity of a bone is where fat is stored.
Option b. is correct. Red bone marrow lies in the spaces in spongy bone.
Option c. is correct. Spongy bone is designed for strength because they follow the lines of stress to support the bone the same way that braces support a building.
Therefore, if options b. and c. are correct, then option d. is correct.
