According to the Acid-Growth Hypothesis, Auxin Works by ________

According to the acid-growth hypothesis, auxin works by ________.

A) dissolving sieve plates, permitting more rapid transport of nutrients
B) dissolving cell membranes temporarily, permitting cells that were on the verge of dividing to divide more rapidly
C) changing the pH within the cell, permitting the electron transport chain to operate more efficiently
D) increasing the activity of proton pumps that lower the pH of cell walls, allowing cells to elongate
E) greatly increasing the rate of deposition of cell wall material