The correct option is B Displacement reaction
Titanium tetrachloride (TiCl4) reacts with magnesium (Mg) to form titanium (Ti) and magnesium chloride(MgCl2). It is a displacement reaction, as the more active magnesium displaces titanium in titanium chloride. The balanced equation can be written as:
TiCl4(l)+2Mg(s)→Ti(s)+2MgCl2(s)