Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz?

The key fact is Point 1. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Memory hook: Capacitors store energy in an electric field.
E = I × R