Thermodynamics and Redox

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TSSVR4

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I'm doing a TPR practice passage in electrochemistry.

There is a reaction that takes in H+ with e- O2 to make H20. The reduction of oxygen is oxidizing a metal.

The question asks why increasing acidity increases the oxidation. I figured more H+ = more reactant, pushing the reaction to the right.

The answer given is: The reduction of oxygen is energetically more favorable as acidity increases.

I chose that because it's the best answer, but it bothers me that it says "energetically more favorable". I thought energetically more favorable means it changes the thermodynamics, which only temperature should be able to do. (Change the Keq)

Thoughts?
 
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