As the separation distance between two charges of the same sign increases, what happens to the electrostatic potential energy?

Question

As the separation distance between two charges of the same sign increases, what happens to the
electrostatic potential energy?
It becomes more negative (i.e., lower)
It becomes less positive (i.e., lower)
It becomes more positive (i.e., higher)
It becomes less negative (i.e., higher)

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