Answer:
The correct answer would be zero.
Water potential measures the tendency of water to move from one area to another.
It is denoted by the symbol ψ.
It is determined by two main factors:
Solute potential (ψs): It is determined by solute concentration.
Pressure potential (ψp): The pressure exerted on a solution. It can be negative or positive.
ψ = ψs + ψp
Thus, in an open container, the water potential of pure water would be zero as pure water does not contain any solute (that is, ψs = 0) and pressure potential is zero (ψp = 0) in an open container.