Answer:
a. formal.
Explanation:
Communication is a vital element used in the presentation. It helps in convincing and impressing the audience about the thought that the presenter wants to display to the audience. Communication and the forms of communication used during the presentation make the audience engaged and acknowledge the ideas. The number of people present in the audience also affects the form of communication used by the presenter. With an increase in the number of audiences, the presenter is more likely to adopt formal communication. This helps him to express his ideas to every person sitting in the audience.
