in 
Before the 2nd semiquaver of the last group, there is no accidental in A (→FE→GE1), which formally gives c
2. A few accidentals, overlooked in A in bars 57-60, allow for assuming Chopin's inattention also in this case. In the entire 4-bar section, in the parts of both hands he used only the notes of the key of F major as transitional notes (second semiquavers of each group). Deviation from this rule in the last figure, based on a chord which directly introduces this key, would be completely incomprehensible. The natural was added in EE and GE2 (→GE3→GE4).
Compare the passage in the sources»
category imprint: Differences between sources; Editorial revisions
issues: EE revisions, Omissions to cancel alteration, GE revisions
notation: Pitch