One Would Expect to Find the Highest Density of Aquaporins

Multiple Choice

One would expect to find the highest density of aquaporins in which of the following?

A) the plasma membrane of guard cells
B) the pits of a tracheid
C) the plasma membrane of parenchyma cells in a ripe fruit
D) the plasma membrane of a mature mesophyll cell in a leaf
E) the membrane lining plasmodesmata