The question asks specifically about the theme carried by the initial impression, so each option should be checked against that first judgment and its reversal, not the later parts of the story.
Since the initial impression is built entirely on appearance and is then reversed, the theme it highlights is that appearances can mislead.
So the correct answer is The deceptive nature of appearances.
Identifying a literary device is easiest when each option's actual definition is applied to the line, rather than just guessing from a feel.
Testing each device's actual definition against the line shows only one fits, the deliberate, larger-than-life overstatement of hyperbole.
So the correct answer is Hyperbole.
Since this is a vocabulary question tied to a specific passage, the safest method is to check how the word is actually used in context before comparing dictionary shades of meaning.
Matching the word to its surrounding context, occult power, magnetism, astral body, points clearly to a believer in the mystical, which is what 'mystic' means.
So the correct answer is Mystic.
Instead of comparing 'boorish' to its antonyms directly, this can be settled by looking at how the passage itself sets the word up, through a contrast with what came after it.
Since the passage frames 'boorish' as the assumption that gets overturned by refinement, the word has to mean the opposite of refined, which is discourteous.
So the correct answer is Discourteous.
The phrase 'quietly pleased' follows directly from a specific detail, the man noticing that the narrator was secretly writing down his words, so the right option needs to explain a reaction to being watched and recorded, not just to being talked about generally.
The specific detail that triggers this feeling, being secretly noted down, only makes sense as a source of pleasure if he enjoys the influence he has over his listener.
So the correct answer is He derived satisfaction from impressing and influencing others.