Ammonia adsorbed at a metal surface at low temperatures is known to dissociate and form NH2(a), which bonds to the surface through the N with C2v symmetry. On heating:
A) The NH2(a) species will dissociate further to form NH3(g).
B) The NH2(a) species will dissociate further to form N2(g) and H2(g).
C) The NH2(a) species will undergo isomerization to form N2H4(g).
D) The NH2(a) species will remain intact and not undergo further dissociation or reaction.