What is the title of the String Quartet in C Minor?

The title of the String Quartet in C Minor being "Allegro" is correct as it refers to a common tempo marking in classical music indicating a lively and fast pace. In many compositions, the first movement is typically marked as Allegro, and it is often the most recognizable or prominent section of the piece. This labeling is intended to convey the overall character and mood of that section. The other terms mentioned, such as Adagio, Prelude, and Rondo, represent different musical forms or tempo markers but do not specifically indicate the title of the entire quartet in the context of its first movement. Hence, "Allegro" is a fitting title for the energetic and vigorous composition characteristic of such works.