A)collagenous fibers surrounding numerous blood vessels. B)osteocytes surrounded by a calcium gel and a meshwork of collagenous fibers. C)chondrocytes surrounded by a protein gel complex and a meshwork of collagenous fibers. D)lacunae containing osteocytes and a meshwork of collagenous fibers. E)a highly variable mixture of protein gel and carbohydrate crystals.