(A) Wall pressure is the pressure exerted by cell wall against turgor pressure.
(B) Suction pressure is the actual pressure by which cell absorb water.
(C) The movement of water from higher concentration to lower concentration through a semi-permeable membrane is called osmosis. The pressure required to stop osmosis is called osmotic pressure.
(D) Turgor pressure is pressure applied against the cell wall.
So, the correct answer is 'Osmotic pressure'.