What does your printout say?

The output from your laser printer is readable, but over the last week the content of every printed page has gradually faded. Instead of dark print, the information on the page is now a shade of gray. What is the most likely cause of this issue?

A) A faulty printer driver

B) The printer nozzles are clogged

C) The photosensitive drum is scratched

D) The toner is low

E) The printer is completely unmotivated