Answer:
A d. source is the originator of the messages expressed.
Step-by-step explanation:
The source, also known as the sender, is one of the essential elements of Communication; it is the one that creates and sends the message to another person or group of people (the receiver). In this process, the source determines the channel by which he or she will transmit the message (for example through speech, face-to-face conversation, phone call, text message, letter, radio), the content of the message and the way he or she will express it which includes a number of factors depending whether the message is oral or not, such as order of words, body language, appearance, tone of voice, writing style and punctuation.