NEED HELP ASAP PLEASEEEE Which reaction is both a redox and a decom- position reaction?

1.
Zn + 2 HCl → ZnCl₂ + H₂
It is a redox reaction as the oxidation number of Zn increases from 0 to +2, and the oxidation number of H decreases from +1 to 0..
It is a displacement reaction, but NOT decomposition. This is because it is of the type A + BC → AB + C.

2.
2KClO₃ → 2KCl + 3O₂
It is a redox reaction as the oxidation number of Cl decreases from +5 to -1, and the oxidation number of O increases from -2 to 0.
It is a decomposition reaction because it is of the type AB → A + B.

3.
NH₃ + HCl → NH₄Cl
It is NOT a redox reaction because there is no change in oxidation number after the reaction occurs.
It is a synthesis reaction but NOT decomposition. This is because it is of the type A + B → AB.

4.
BaCO₃ → BaO + CO₂
It is NOT a redox reaction because there is no change in oxidation number after the reaction occurs.
It is a decomposition reaction because it is of the type AB → A + B.

The answer: 2. 2KClO₃ → 2KCl + 3O₂

There are two decomposition reactions shown, 2 and 5. (Decompositions are easy to recognize because they have only one reactant.)
In 5 none of the atoms change oxidation state, so 5 is not a redox reaction.

In 2, O is oxidized and Cl is reduced, so 2 is a redox reaction.