Which of the following tempos is characterized as slow?

The tempo characterized as slow is "Adagio." In musical terminology, "Adagio" typically indicates a slow pace, often conveying a calm and leisurely feel. It is generally understood to be slower than "Andante," which means a moderate pace. While "Allegretto" is somewhat faster than "Andante," it is also slower than "Allegro." "Presto," on the other hand, represents a very fast tempo. Understanding these distinctions helps in interpreting the emotional and expressive intentions of a piece of music, with "Adagio" specifically setting a serene and reflective mood suitable for slower passages.