Discussion
The relative permittivity of a material exceeds the susceptibility by
Answer: A
From \( \mathbf{D} = \epsilon_0\mathbf{E} + \mathbf{P} \) and the definition of susceptibility, \( \epsilon_r = 1 + \chi_e \). A vacuum has zero susceptibility and unit relative permittivity, which is the consistency check on the relation.
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