The apical ectodermal ridge:

A. forms at the proximal end of each limb bud.
B. plays a role in differentiation and elongation of the limb.
C. ossifies prior to formation of the hand and foot plates.
D. must undergo apoptosis before the limb can develop.
E. secretes mesoderm for muscle formation.

B. plays a role in differentiation and elongation of the limb.

Explanation:

Apical ectodermal ridge can be defined as an anatomical structure that develops in the ectodermal cells at the end of the limb bud. It acts as a signaling center that enables the development of the limb. It is present on the distal end of the limb bud.

The ectodermal ridges are associated with the proliferation and differentiation of the mesenchymal cells which favors the rapid elongation of the limb precursor.