Only molarity must be used as solution concentration in the calculation of freezing point depression, boiling point elevation, and osmotic pressure.

Both molarity and molality can be accurately used in expressing solution concentration when computing for freezing point depression, boiling point elevation, and osmotic pressure.

Molarity must be used to express solution concentration when calculating freezing point depression and boiling point elevation, while molality must be used in osmotic pressure calculations.

Molality must be used when calculating freezing point depression and boiling point elevation, while molarity can be used for osmotic pressure calculations.