Select the correct statement from the following:

• A
  Only the net direction of osmosis,not the rate of osmosis,depends on both the pressure gradient and concentration gradient.
• B
  The rate of osmosis depends only on the pressure gradient.
• C
  The net direction and rate of osmosis depend upon both the pressure gradient and concentration gradient.
• D
  The net direction and rate of osmosis do not depend on the pressure gradient and concentration gradient.