In the communication process, successful transfer of message can be checked through

Feedback is the answer, and it is the only option that closes the loop. The sender encodes an idea into symbols, sends it through a medium, and the receiver decodes it. The sender can only know whether the meaning arrived intact when the receiver responds through a reply, an action or a nod. That return signal is feedback.

• A) Encoding: This is the sender's act of converting thoughts into words, gestures or signs. It starts the process, so it cannot verify its success.
• B) Medium: This is the channel, such as a letter, phone call or speech. It carries the message but does not tell anyone whether it was understood.
• D) Passive decoding: Decoding is the receiver's interpretation, and it is active, not passive. It is not a standard stage of the model, and even correct decoding is invisible to the sender unless feedback returns.

Core concept: feedback and the two-way nature of communication. Mains angle: the same logic underlies citizen charters, public grievance redressal and field-level feedback in district administration, where a scheme is judged successful only when beneficiary response confirms it reached them.

Trap: Students pick medium because it is the most visible part of the process, but the channel only transports the message; it never confirms receipt.