Which of the Following Equations Best Describes the Reaction That $\rightarrow$

Which of the following equations best describes the reaction that occurs when potassium metal reacts with oxygen gas in a combination reaction?

A) K(s) + O₂(g) $\rightarrow$ KO₂(s)
B) 4K(s) + O₂(g) $\rightarrow$ 2K₂O(s)
C) K(s) + O₂(g) $\rightarrow$ KO(s) + O(g)
D) 2K(s) + O(g) $\rightarrow$ K₂O(s)
E) K(s) + O(g) $\rightarrow$ KO(s)