Final answer:
The correct answer is c. Medium. A medium is the communication channel used to transmit a message from sender to receiver.
Step-by-step explanation:
In the basic model of communication, a channel refers to the medium used to transmit the message from the sender to the receiver.
Based on the options given, the correct answer is c. Medium. A medium can be any form of communication that carries the message, such as a telephone, email, or television.
An example would be if you were texting a friend, the smartphone you're using would be the channel or medium through which the message is sent and received.