not use / folded papers / in other words / papers / smooth / clean

• A. 
  Not using folded papers. In other words, the papers must be smooth and clean.
• B. 
  Don’t use folded papers. In other words, the papers must be smooth and clean.
• C. 
  Not to use folded papers. In other words, the papers must be smooth and clean.
• D. 
  And not using folded papers. In other words, the papers must be smooth.