The reaction $2KClO_{3(s)} \longrightarrow 2KCl_(s)+3O_{2(g)}$ is a(n)

Question

$\begin{array}{1 1} \text{(a) synthesis reaction.} \\ \text{ (b) decomposition reaction.} \\ \text{ (c) combustion reaction.} \\ \text{ (d) combination reaction.} \end{array} $