Writing the most important word in large, bold letters on a poster is an example of what?

Correct answer: Emphasis through typography

The governing concept is emphasis in visual communication. Increasing a word’s size and letter weight makes it stand out from surrounding text, so the viewer reads it as the priority message. Thus option A is correct. Symmetry concerns balanced arrangement, texture concerns surface quality, and absence of colour does not by itself make a particular word visually dominant.