How Do Bones Lengthen and Thicken as Individual Mammals Grow

How do bones lengthen and thicken as individual mammals grow and develop?

A) Via appositional deposition of new bone beneath the periosteum
B) By continual flaking and layering of osseous tissue
C) By creating and filling tiny fractures throughout bones in a controlled, systematic manner
D) Via directional adsorption of new bone in a radial pattern
E) By acidification of osseous tissue, allowing it to stretch and lengthen