Answer:
a. messages
Step-by-step explanation:
a. is the correct answer choice. In communication, the message is the information that is being conveyed by the sender to the receiver. It can be communicated in various ways, by words, messages, symbols, expressions, etc. That means the messages can be communicated through both verbal and nonverbal processes.
b. is not the correct answer. In the communication process culture is a context in which communication is being held, and can effect message.
C. is not the correct answer. Language is a verbal way of sharing information.
d. is not the right answer. Channels are various ways to convey messages and information in the communication process.