None of these answers would answer your question, that's sorta redundant ain't it?
answered: Guest
By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.
answered: Guest
if you listed your answers right then i believe your answer is b.