Answer:
A tempo and bpm are the correct answer.
Explanation:
A tempo is used after a change of tempo, to indicate that the person playing the instrument or singing should return to the original or main tempo. B is correct.
BPM stands for beats per minute and it is used to measure the tempo of a piece of music (tempo refers to the pace or speed of a piece.) So, a tempo marking of presto indicates a very quick BPM.
