Which of the following formulae is used to calculate the depression in freezing point?
- A$ \Delta T_{f} = \frac{T_{f}^{\circ}}{T_{f}} $
- B$ \Delta T_{f} = T_{f}^{\circ} - T_{f} $
- C$ \Delta T_{f} = T_{f} - T_{f}^{\circ} $
- D$ \Delta T_{f} = \frac{T_{f}}{T_{f}^{\circ}} $
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