'अरे! कितना सुन्दर दृश्य है!' — 'अरे' क्या है?

उत्तर: (C) विस्मयादिबोधक अव्यय — 'Are!' is Vismayaadibodhak Avyay (interjection) — expresses surprise/emotion. Others: Wah! (praise), Alas!/Haye! (sorrow), Shh! (silence), Oho! (realization). Always followed by exclamation mark.