The correct option is C Parallelism
The sentences in question confirm to parallelism because the use of 'were' and 'was' correspond to each other and for the sentences to be parallel a balance needs to be maintained within the sentence by using and repeating similar elements of grammar. The sentences in question are not an exaggeration, but a simple statement of facts, and they are not ironic. Though the repetition of 'nobody' implies emphasis, it is not common to all four sentences. So, option C is the answer.