The correct answer is (B) Displacement reaction.
In this reaction, zinc (a more reactive metal) displaces hydrogen from acetic acid, which is a characteristic of displacement reactions.
In a displacement reaction, a more reactive element displaces a less reactive element from its compound. Here, Zn displaces H₂ from CH₃COOH. This is analogous to Zn + H₂SO₄ → ZnSO₄ + H₂ discussed in Chapter 1. Do not confuse it with double displacement, where two compounds exchange ions with each other.
Source: Chapter 1, Chemical Reactions and Equations