Dewey Decimal Printer

One of your customers needs a new printer for the study area of a university library. The primary requirement of this printer is to be as quiet as possible. Which of these printer types would be the best fit for this requirement?

A) Laser

B) Inkjet

C) Dot-matrix

D) Thermal

E) Sit an art major in a chair with a pad of paper and some watercolors (color printing!)