The word 'querulous' is employed as an adjective to denote 'an often complaining or suggesting a complaint in expression.' In the given sentence, the most adequate denotation of this word would be 'whining' to connote that if Emma wears a leather jacket along with her spiked pink hair, her father would <u>express a complaint or fretful reaction</u> to this. Thus, <u>option C</u> is the correct answer.
