Water potential of a solution is :

• A

  ${\mathrm{\psi }}_{\mathrm{w}}=+\mathrm{ve}$

• B

  ${\mathrm{\psi }}_{\mathrm{w}}={\mathrm{\psi }}_{\mathrm{p}}$

• C

  ${\mathrm{\psi }}_{\mathrm{w}}=0$

• D

  ${\mathrm{\psi }}_{\mathrm{w}}=-\mathrm{ve}$