The Importance of Abscisic Acid in the Water Conservation of a Leaf

The importance of abscisic acid in the water conservation of a leaf is that it

A) reacts with cuticle to seal any pores and expand to cover the stomatal openings.
B) triggers a change in osmotic potential of the guard cells in a drought, forcing them to lose water and collapse to close.
C) forces water in the leaf to flow through the endodermis, through the Casparian strip, and stay in the vascular tissues.
D) interacts with the polar water molecules to produce positive pressure flow of the phloem solution.
E) forces a change in osmotic potential of the guard cells to fill them with turgor pressure, opening them for transpiration.