3. Blanche doesn't want him to see her which putting the lantern on will dim the light
Answer:
i think it was Jay Gatsby
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! :)