(b) Public communication
Public communication takes place when one individual addresses a large gathering. Examples include election campaigns and public speeches by dignitaries.
Source: Session 2: Verbal Communication, Table 1.2, Chapter 1
The answer is directly from Table 1.2 in Session 2. The definition of Public Communication exactly matches the question — "This type of communication takes place when one individual addresses a large gathering." For MCQs, always look for the exact definition in the textbook. No extra writing needed beyond naming the option and a brief justification.