Question

what does largo mean?
play softly
play slowly
the length of the rest
the length of the pitch

Explanation:

In music terminology, "Largo" is a tempo marking. It specifically indicates a slow tempo. "Play softly" would be related to dynamics (e.g., piano), not tempo. "The length of the rest" and "the length of the pitch" are not relevant to the meaning of "Largo".

Answer:

Play slowly