Why is orange useful for attracting attention in a poster?

Correct answer: It is a warm and energetic colour

Poster design uses colour emphasis to guide the viewer’s eye toward important words or images. Orange is a warm, lively and visually noticeable colour, so it can attract attention when used deliberately; therefore option A is correct. It is not always neutral, does not necessarily recede into the background, and has noticeable visual energy. Good poster design still requires contrast, balance and controlled use rather than filling everything with orange.