Written communication uses written symbols such as letters,emails,notices or reports to convey messages. An email announcing a change in exam date is text based and can be read later by recipients. Hence it falls clearly in the category of written communication.
Option A:
Oral communication would occur if the teacher announced the change verbally in class or over a microphone,which is not described.
Option B:
Non verbal communication uses gestures,facial expressions or posture and does not rely on written words.
Option C:
Written messages create a record that can be referred to again,which is one advantage of the email example given,making option C correct.
Option D:
Mass communication refers to broadcasting messages to very large audiences through media like TV,and is not the main feature highlighted in the stem.
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