Under Basic Conditions,the Aldol Reaction Is Reversible,but Dehydration Is Not

Under basic conditions,the Aldol reaction is reversible,but dehydration is not.What is the reason for this difference in reactivity?

A) The initial Aldol product is an alkoxide,so the reaction is not energetically downhill in either direction.
B) The initial Aldol product is an alkoxide,so the reaction is energetically downhill going toward the product.
C) The initial Aldol product is an alkoxide,so the reaction is energetically downhill going toward the starting materials.
D) Water is a stable molecule.