What type of reaction corresponds to the laboratory process of obtaining oxygen from potassium permanganate?

When considering the proposed options, the correct answer is B) – the decomposition reaction.
Let’s give an example of an equation that explains the process of laboratory production of oxygen:
2KMnO4 = K2MnO4 + MnO2 + O2
The reaction takes place when the salt is heated – KMnO4. The process of decomposition of potassium permanganate leads to the release of oxygen in a gaseous state, and also compounds are formed – potassium manganate (K2MnO4), manganese oxide (MnO2). This is how oxygen is obtained in the laboratory.