Which factor most effectively activates the respiratory center?

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Reduction in the level of carbon dioxide in arterial bloodRise in the concentration of carbon dioxide in arterial bloodElevation of oxygen levels in arterial bloodNo listed options are correct

Explanation

The respiratory center is primarily stimulated by an increase in arterial carbon dioxide levels, which triggers an enhanced breathing response to expel excess CO2. A decrease in CO2 or an increase in oxygen does not stimulate the respiratory center as strongly.