Answer: Consider the demographic characteristics of his classmates.
Explanation: The first thing that is expected of Martin to deliver a brief speech to his class is to consider the demographic characteristics of his classmates.
Speech making process steps are:-
* Analyze audience
* Select a topic
* Determine speech purpose
* Compose a thesis statement
* Develop main points
* Gather supporting info
* Separate into major parts
* Outline the speech
* Consider presentation aids
* Practice delivery