Correct Option: D

Water potential is defined as the difference between the chemical potential of water at any point in a system and that of pure water under standard conditions. The unit of measurement of water potential is pascal, Pa (1 mega pascal, Mpa = 10 bars). It is represented by greek letter PSi (Ψ). Water potential has two components-solute potential which is always negative and pressure potential which is usually positive. Therefore water potential Ψ_w is expressed as :
Ψ_w = Ψ_s + Ψ_p