What can be concluded when the main information in a poster is written in small letters but in a highly contrasting colour?

Correct answer: Colour contrast may attract attention but small size can limit readability

The governing concept is the difference between visual emphasis and legibility. A strongly contrasting colour can make the small text noticeable, but readability also depends on letter size, spacing, and viewing distance. Thus attention may be gained without making the message easy to read. Option D is correct; the other choices use absolute claims or ignore important typographic factors.