During urine formation,which of the following processes creates high osmotic pressure in the uriniferous tubule?

• A
  Active $Na^{+}$ absorption,followed by absorption of $Cl^{-}$
• B
  Active $Cl^{-}$ absorption,followed by absorption of $Na^{+}$
• C
  Active secretion of $Na^{+}$ into efferent arteriole followed by absorption of $Cl^{-}$ into efferent renal arteriole
• D
  Active secretion of $Cl^{-}$ and absorption of $Na^{+}$ into efferent renal arteriole