What does impedance matching ensure when a wave travels from one medium to another?

Correct option is C

​$$\text{Impedance matching ensures that the characteristic impedance of the source (or first medium) matches that of the load (or second medium).} \\[8pt]\text{When impedances are matched:} \\[6pt]\bullet \ \text{Reflections at the boundary are minimized (ideally zero)} \\[4pt]\bullet \ \text{Maximum power/energy is transmitted into the next medium} \\[4pt]\bullet \ \text{Signal integrity is preserved (important in RF, transmission lines, antennas)} \\[10pt]\text{Mathematically, the reflection coefficient becomes zero when:} \\[8pt]Z_L = Z_0$$​​