What is the title of the first movement of Symphony No. 5 in C Minor?

The title of the first movement of Beethoven's Symphony No. 5 in C Minor is "Allegro con brio." This movement is renowned for its iconic four-note motif that opens the symphony, which is both memorable and sets the dramatic tone for the entire work. The term "Allegro con brio" indicates a fast tempo (Allegro) with spirit (con brio), which reflects the energetic and intense character of the music.

In the context of the other options, "Allegro moderato" refers to a different tempo marking and is not applicable to the opening movement. "Adagio" suggests a slow tempo and does not relate to the first movement of this symphony, which is vibrant and dynamic. While "Symphony No. 5, I" might seem to describe the first movement, it does not convey the specific musical character or tempo that the title "Allegro con brio" does. Hence, the correct answer highlights both the identity and the essence of the movement.