The purpose of establishing a response structure is to:

Under CBCI 7.0, response structure development sits in Enabling Solutions (PP5) because it makes the BCMS operational: it defines who responds, how they coordinate, and how decisions and recovery actions are managed during disruption. The core purpose is to ensure the organization has the right teams and role-holders in place to respond to incidents regardless of cause—since BC response structures are typically “all-hazards,” designed to manage disruption impacts whether triggered by technology failure, supplier outage, facility loss, cyber incident, or other events. (ready.gov)

Option C (visual reference) can be a helpful output (e.g., org charts), but it is not the purpose. Option D (alignment with existing chains of command) is often desirable to reduce confusion, but again it is a design principle rather than the fundamental purpose. Option A (awareness) is part of culture/communications work (PP2), not the main reason a response structure exists. Therefore, B best matches the BCMS intent: ensure teams and roles exist to respond effectively to incidents and coordinate recovery.