Tempo I in music
Tempo I indicates that the performer should return to the first tempo marking of the piece after a section played at a different tempo. When there are multiple tempo changes throughout a piece of music, the composer may indicate the original tempo as "Tempo I" to go back to that tempo after a section in a different tempo.
So in your case, where section C of the music has a marking of "Tempo I", it means that section C should be played at the same speed as the very beginning of the piece, returning to that original tempo.
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