What is the rumor about the principal?

The choice indicating that the principal is retiring soon accurately reflects a common type of rumor that can circulate in a school environment. When a principal's tenure is perceived to be ending, speculation about retirement often arises, particularly if there are signs or discussions hinting at a transition in leadership. This kind of rumor typically generates more attention and concern within the school community as it affects the future leadership and direction of the institution.

In contrast, the other options involve situations that, while plausible, do not carry the same weight of finality as retirement. Promotion might suggest an advancement within the field, which is less about exiting and more about progression; hiring new staff relates to operational changes rather than personal transition for the principal; and going on sabbatical implies a temporary leave rather than the permanent change that retirement signifies. Thus, the emphasis on the finality of retirement makes it the most relevant choice when discussing rumors regarding a principal.