Oxygen and hydrogen gases react with each other explosively according to the equation

2H2(g) + O2(g)  2H2O(g)
ΔH = –242 kJ mol–1
Why is it that a vessel containing oxygen and hydrogen gases can exist indefinitely without exploding?

answer in one sentece

A vessel containing oxygen and hydrogen gases can exist indefinitely without exploding because the reaction between oxygen and hydrogen requires an activation energy to initiate the reaction.

A vessel containing oxygen and hydrogen gases can exist indefinitely without exploding because the reactants require an activation energy to overcome their energy barrier and initiate the explosive reaction.

A vessel containing oxygen and hydrogen gases can exist indefinitely without exploding because in order for a reaction to occur, there must be sufficient activation energy provided, which may be lacking in the absence of a spark or flame.