A 0010 Molal Solution of Ammonia in Water Is 4 $\rightarrow$

A 0.010 molal solution of ammonia in water is 4.1% ionized.

NH₃(aq) + H₂O(l) $\rightarrow$ NH₄⁺(aq) + OH^-(aq)
Given that pure water freezes at 0°C and the k_F for water is 1.86°C/m, which of the following expressions gives the freezing point depression of the aqueous ammonia solution?

A) T_FP = -(1.86 °C/m) (0.01 m)
B) T_FP = -(1.86 °C/m) (0.01 m) (1.041)
C) T_FP = -(1.86 °C/m) (0.01 m) (2.082)
D) T_FP = -(1.86 °C/m) (0.01 m) (4.1)
E) T_FP = -(1.86 °C/m) (0.01 m) (8.2)