Final answer:
The mission statement is the correct answer as it unifies an organization's efforts and describes its purpose.
Step-by-step explanation:
The mission statement is a clear and compelling statement that unifies an organization's efforts and describes what the firm is all about, i.e., its purpose.
It's designed to guide the direction of the organization, providing a path to follow and setting an observable goal by which to gauge progress.
A mission statement typically addresses the organization's purpose in a way that resonates with the stakeholders and gives meaning to the work being done.
In contrast, a vision statement describes where the organization aspires to be in the future, a strategic initiative outlines the approach taken to achieve specific goals, and business ethos reflects the underlying values or principles of an organization.