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.