Everyone in the bazaar turned to stare at the visitor and his preposterous dress.

Answer: Option C

Pompous : affectedly grand, solemn, or self-important.
Vague : of uncertain, indefinite, or unclear character or meaning.
Absurd : wildly unreasonable, illogical, or inappropriate.
Strange : unusual or surprising; difficult to understand or explain.
Preposterous : contrary to reason or common sense; utterly absurd or ridiculous.

Synonym of Preposterous is Absurd