Answer: Option (b) is the correct answer.
Explanation:
Displacement reaction is a reaction in which a more reactive element displaces less reactive element.
When there is displacement of two elements in a chemical reaction then this type of reaction is known as double displacement reaction.
For example, [tex]MgCl_{2} + Li_{2}CO_{3} \rightarrow MgCO_{3} + 2LiCl[/tex]
In this reaction Cl is displaced by [tex]CO_{3}[/tex] and Li is displaced by Mg. So, it is a double-displacement reaction.
