What is the title of the piece composed by Franz Joseph Haydn?

The correct title of a piece composed by Franz Joseph Haydn is indeed the "Trumpet Concerto in E Flat Major." Haydn is known for his significant contributions to the development of classical music, particularly in the areas of symphonies, string quartets, and concertos. The Trumpet Concerto, composed in 1796, exemplifies Haydn's innovative style and his ability to highlight the capabilities of the trumpet, which was still evolving as an instrument during this period.

In this concerto, Haydn blends lyricism with virtuosic displays, making it a favorite among trumpet players and audiences alike. It showcases a range of emotions—from joyful and triumphant to lyrical and reflective—illustrating Haydn's skill in orchestration and melodic development.

The other options provided refer to pieces by different composers: "Eine kleine Nachtmusik" was composed by Wolfgang Amadeus Mozart, "Piano Concerto in A Major" is associated with several composers, but not specifically with Haydn, and the "String Quartet in C Minor" is a work by Beethoven. Each of these pieces contributes to the rich tapestry of classical music, but only option C is attributed to Haydn.