Which of the following statements is/are correct? (i) Urine is hypertonic in distal convoluted tubule. (ii) When the urine passes into the collecting tubule, it becomes hypotonic. (iii) Urine is isotonic in proximal convoluted tubule. (iv) Urine becomes more and more hypotonic as it passes through the Henle's loop.

• A. (i) and (iv) only
• B.                    (i), (ii), and (iii) only
• C. (ii) and (iii) only                         
• D. (iii) only