Answer:
<em>A</em><em>n</em><em>s</em><em>w</em><em>e</em><em>r</em><em>:</em><em> </em>The answer is Increases
An argumentative text claims that a certain opinion is the only valid opinion.
Perhaps Dunbar uses the image of a mask as wearing a face allows us to conceal our face - enabling us to hide any expression or emotion. In his poem, he mentions how black people felt the need to appear as content or happy when surrounded by people who were white - especially when they felt the opposite. The mask represents the false expressions the blacks had to wear.
I think the answer would be C, because an implicit theme is one that's hidden in the story and you kind of have to dig into the piece and look for it.