Which statement about aquaporins is false?

A) They transport water and hydronium ions efficienty

B) They exclusively transport water molecules at a high rate

C) They use hydrogen bonding to side chain NH2 groups of 2 Asn residue to exclude proton transport within the pore

D) They have a narrow constriction approximately equal to the van der waals diameter of a water molecule

E) They use Arg and His side chains to remove associated water molecules from the ‘transported’ H2O