The correct answer is: A. oral communication.
Oral communication is the exchange of messages through spoken words. It is the most basic and natural form of communication, and it is the primary way that humans interact with each other. Oral communication can be used to convey a wide range of information, from simple facts to complex ideas. It can also be used to express emotions, build relationships, and persuade others.
Written communication is the exchange of messages through written words. It is a more formal form of communication than oral communication, and it is often used to convey complex information or to communicate with people who are not physically present. Written communication can take many forms, including letters, emails, reports, and essays.
Gestural communication is the use of gestures to convey meaning. It is a nonverbal form of communication that can be used to supplement or replace spoken words. Gestures can be used to express emotions, to indicate agreement or disagreement, or to direct someone’s attention.
Sideward communication is a type of communication that is used to convey information to someone without the other person being aware of it. It can be used to send messages of support, to warn someone of danger, or to communicate with someone who is not supposed to hear what you are saying.
I hope this helps!