Which concept is particularly significant in agenda-setting theory related to public relations?

Salience is a crucial concept within agenda-setting theory, as it refers to the prominence or importance that issues hold in public discourse and media coverage. In the context of public relations, salience reflects how certain topics are prioritized in the minds of the audience due to their coverage and representation in the media. This theory suggests that the more an issue is discussed and highlighted, the more likely the public will perceive it as important.

In public relations, practitioners often seek to enhance the salience of specific issues because when topics gain visibility and attention, they can significantly influence public opinions and attitudes. By effectively managing communication strategies that increase the salience of an organization's message or cause, public relations professionals can ensure that their stakeholders view these issues as significant and urgent.

The other choices like pertinence, attitudes, and opinions have their roles in communications and public relations but do not specifically align with the essence of agenda-setting theory, which focuses on the media's role in shaping what subjects are deemed important.