The theme that's developed by Melville in this excerpt from the chapter is A. Obsession.
The theme of a story simply means the main idea that the author wants to pass across to the readers. It is the message that the speaker wants the audience to know.
In this case, the theme represented here is obsession. The character was described well by Melville. She described the character's glance, arms, etc because she was obsessed.
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