In a multistage amplifier, why is the coupling of stages typically done using capacitors?

Correct option is A

​$$\text{In a multistage amplifier, each stage usually has its own DC biasing condition. Coupling capacitors are used to:} \\[8pt]\bullet \ \text{Block DC voltages from one stage reaching the next} \\[4pt]\bullet \ \text{Allow AC signals to pass between stages} \\[4pt]\bullet \ \text{Ensure that the biasing of each stage remains independent} \\[8pt]\text{This prevents bias shift and distortion while maintaining proper amplification.}$$​​