Concept:A capacitor is often named after the dielectric material placed between its plates.Explanation:A mica capacitor uses mica as its dielectric.Mica provides high stability, low energy loss, and strong insulation.Option A is wrong because the plates are not made of mica.Option D is wrong because capacitance is not equal to the capacitance of mica itself.Option C has the same meaning, but option B gives the standard technical description.Answer:B. a mica dielectric.