Answer: mp
Step-by-step explanation: In the piece "Dona Nobis Pacem" by the Orquesta Sinfónica de Galicia, the director of the orchestra marks a dynamic of mp at minute 9. "mp" in music means to play "mezzo piano" (which means moderately quiet), so when the piece is in a very intense place because the orchestra is playing forte (strongly), the director indicates to moderately decrease the volume of the instruments.