How is a speech least like an essay?

select one:
a. it limits pronoun use.
b. it has an objective.
c. it reiterates key points.
d. it develops a theme.

 Like an essay, a speech has to have a reason, an objective, to exist. Why would someone hold a speech? To give an objective, explain his/her argument and the logic to get his/her audience to understand his/her point. 

Is there supposed to be an image with this question?