During the initial step of the chloride process used to produce titanium, the reaction below takes place. $2\text{TiO}_2 + 4\text{Cl}_2 + 3\text{C} \rightarrow 2\text{TiCl}_4 + 2\text{CO} + \text{CO}_2$ In this reaction, what is reduced?
- Acarbon
- Bchlorine
- Coxygen
- Dtitanium