Answer:
to convince the public to support an idea to entertain the audience by describing a recent event to explain a complicated political process to showcase the speaker's public speaking skills.
Explanation:
the third one, if you add the comma without the when then you would have a comma splice (when you put a comma between 2 independent clauses without a conjunction) adding the when before Cynthia makes the first part a dependent variable and makes it okay to add the comma!
Hope this helps! :)
