How does indirect characterization take place in this excerpt from Gaston Leroux’s The Phantom of the Opera? He found them both looking extremely worried. Their own friends did not recognize them: they had lost all their gaiety and spirits. They were seen crossing the stage with hanging heads, care-worn brows, pale cheeks, as though pursued by some abominable thought or a prey to some persistent sport of fate.

A.
through the characters’ speech
B.
through the characters’ thoughts
C.
through the characters’ appearance
D.
through the characters’ actions