Water is best transporting medium in plants for dissolved minerals and food molecules.
Choose correct option considering following properties of water-
i. Water is in liquid form at room temperature.
ii. Water is best solvent for most of the solutes.
iii. In pure form its pH is neutral.
iv. It is most active inorganic compound.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.