Which of the Following Statements Is TRUE Regarding the Movement

Which of the following statements is TRUE regarding the movement of water through the xylem of vascular plants?

A) It is not uni-directional (e.g., water can be transported both toward the leaves and toward the roots) but always flows from "wetter" to "drier."
B) It depends on differences in turgor pressure in the leaves versus roots.
C) It requires an input of metabolic energy in the form of ATP.
D) It travels through the hollow centers of cells that lack cytoplasm and membranes.