Answer: Relevant
Explanation:
Relevant factors describes about appropriation and link to the topic of the content.It should establish connection with the speech or material that is being present in front of audience with relevant and associated introduction.People get the hint about the upcoming content through it..
According to the question relevancy is important for connecting with audience and gain their attention and interest in the further content.If irrelevant introduction is given then it might lead to distraction or boredom for audience.
Other options are incorrect because humor,briefness and construction are the major factor required in a introduction.Thus the correct option is relevant.
