Why Inductive reactance is XL = 2πfL, so reactance is directly proportional to frequency: double the frequency and you double the opposition. Physically, a faster-changing current produces a larger back-EMF in the coil, which opposes the current more strongly. Reactance depends only on frequency and inductance, not on how large the voltage or current happens to be.
Watch out The choice saying reactance falls as frequency rises describes a capacitor, where XC = 1/(2πfC); the amplitude-based choices are wrong because reactance is independent of signal level in a linear component.
XL = 2πfL: inductors go UP with frequency, capacitors go DOWN. Amplitude never enters the formula.