What is the title of the piece conducted by George Szell?

The piece conducted by George Szell is "Eine kleine Nachtmusik, III." This choice is an iconic work by Wolfgang Amadeus Mozart, specifically the third movement of his "Eine kleine Nachtmusik," which is known for its lively and upbeat character. Szell's interpretation is significant as he was a renowned conductor known for his precise articulation and elegant phrasing, both of which enhance the charm and vivacity of this particular piece.

The other options represent well-known compositions but do not align with Szell's conducting repertoire in this context. The "String Quartet in C Minor" is a chamber music piece by a different composer, while the "Trumpet Concerto in E Flat Major" and "Symphony No. 40 in G Minor" are notable works, but they do not directly connect to Szell's conducting achievements in the same way as "Eine kleine Nachtmusik." Szell's legacy is often highlighted through his mastery in interpreting orchestral works, and this specific choice reflects that association vividly.