Correct option is B
The incorrect part is (B).
Detailed Analysis
- The Error: "...is truly most unique..."
- The Rule: "Unique" is an absolute adjective. By definition, something unique is one-of-a-kind; it cannot be "more unique," "most unique," or "very unique." You cannot qualify a state that does not have degrees of comparison.
- The Correction: Remove the word "most." The sentence should read: "Her style of fashion is truly unique..."
Breakdown of Other Parts
- (A) Her style of fashion: Correct. This identifies the subject of the sentence.
- (C) and stands out: Correct. The singular verb "stands" agrees with the singular subject "style."
- (D) from the crowd: Correct. This is the standard idiomatic preposition used with the phrasal verb "stand out."
Grammar Guide: Absolute Adjectives
Absolute adjectives describe a total or finished state. Since you cannot be "more" or "less" of these things, you should avoid using qualifiers like most, more, very, or extremely with them.