$K_f$ for water is $1.86{\text{K kg mol}}^{-1}$. If your automobile radiator holds $1.0\text{kg}$ of water, how many grams of ethylene glycol (${\text{C}}_2{\text{H}}_6{\text{O}}_2$) must you add to get the freezing point of the solution lowered to $-2.8^{\circ }\text{C}$?

1. A
   $72\text{g}$
2. B
   $93\text{g}$
3. C
   $39\text{g}$
4. D
   $27\text{g}$