Which of the following statements is not true?

• A
  Descending limb of loop of Henle is impermeable to solutes.
• B
  Distal convoluted tubule functions in $K^+, Na^+$ homeostasis.
• C
  Descending limb of loop of Henle is impermeable to water.
• D
  Loop of Henle is largely responsible for concentrated urine.