General exam question G6A04

WhyA characteristic of an electrolytic capacitor is high capacitance for a given volume. An electrolytic capacitor uses a very thin oxide layer as its dielectric, which lets it pack a large amount of capacitance into a comparatively small physical volume, answer C. Electrolytics have relatively loose tolerance, tend to have more leakage than film or ceramic types, and their polarized, higher-leakage construction makes them a poor choice as an inexpensive RF capacitor, so A, B, and D don't describe them.