Which of the following statements best summarizes the acid growth hypothesis in an actively growing shoot?

A)Auxin stimulates proton pumps in the plasma membrane and tonoplast.
B)Auxin-activated proton pumps lower the pH of the cell wall, which breaks bonds and makes the walls more flexible.
C)Auxins and gibberellins together act as a lubricant to help stretch cellulose microfibrils.
D)Auxins activate aquaporins that increase turgor pressure in the cells.
E)Auxins and gibberellins are transported to the vacuoles to build up turgor pressure.