Passive because the subject of the sentence is acted on by the verb.
Answer:
C) While Nora had never really considered herself an unhappy woman
because of her nice home and even nicer husband.
Explanation:
There is no subject and verb. There is Nora and her considering herself this and that, but it says "While Nora", meaning that something has to come after that to contrast this statement. The word "while" is a subordinating conjunction, so the phrase that goes along with it is a sentence fragment.
