The impression or pattern that can be seen when paper is held up to the light is called a ____.

A) photo-sensitive mark
B) watermark
C) letterhead
D) logo
E) copyright

Watermark

A recognizable image or pattern in paper or digital form that appears as various shades of lightness/darkness, used to identify authenticity and prevent counterfeiting.

Photo-sensitive Mark

A type of indicator or feature on an object that changes its appearance in response to light exposure.