Which Statement About the Collecting Ducts of Nephrons Is False

Which statement about the collecting ducts of nephrons is false?

A) Collecting ducts run from the cortex, through the medulla, and empty at the ureter.
B) The fluid within collecting ducts becomes increasingly concentrated as water leaves by osmosis.
C) Urea is the major solute within collecting ducts.
D) The ability of mammals to concentrate urine depends on the lengths of their collecting ducts.
E) Urea diffuses out of collecting ducts but is recycled via the loop of Henle.