Answer: The right answer is the <em>Moldau</em> (in German) or the <em>Vltava</em> (in Czech).
Explanation: Just to elaborate a little on the answer, it can be added that this piece is part of a larger work called <em>Má vlast, </em>which means “My Homeland,” completed by the Czech composer in 1874. <em>The Moldau</em> is the most popular of the six movements and it describes the course of the Vltava as it flows through the countryside and into Prague. Smetana composed it with a nationalistic and patriotic agenda in mind, and so it was received and embraced by his countrymen.
Portraits were important in early history because if we had found those paintings and pictures we can determine what there life back then was and what materials they had in the past then what higher materials we have now.