Answer: Feedback (D)
Explanation:
Feedback refers to the reaction or response of the receiver to the message of the sender. The essence of communication is feedback and it is the final step of the communication process. Communication is incomplete without getting feedback from the receiver. The feedback can either be a written message, oral message, action or silence.
Sending or transmitting message is only half of the communication process, it is when the messages get to the receiver and he or she decodes the message and then sends his or her response to the sender that the communication process is complete.
Feedback enables the sender of a message to determine the effectiveness of his or her message. In a situation whereby the receiver does not understand the message, the sender resends it or modifies the message.