The cause and effects of snobbery are explored by Katherine Mansfield in "The Doll's House." is passive voice. Thus the correct answer is B.
What is passive voice?
A Passive Voice is used to indicate attention to the person or thing that is undergoing an activity rather than the one that is performing it.
To identify the event of passive voice one must look take care of the action taken place in the sentence rather than emphasize the subject.
In the given sentence, the action is "snobbery is explored by Katherine Mansfield" as well use of the preposition "by" is there which indicates it as Passive voice.
Therefore, option B is appropriate.
Learn more about Passive voice, here:
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