A counter argument is necessary, in order to show one's audience that one has taken into account the opposing opinion/thesis of the argument but still sides with their opinion/thesis; it allows the writer to once again prove their thesis.
Gaius, Decimus and Marcus stabbed him to death.
The answer is C. Appear is a verb and singular verbs normally end in -s. Also the sentence is talking about the conductor, not the pictures.
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