The role of a spokesperson for an organization during an incident includes:

Within PP5 (Enabling Solutions), communications arrangements are enabled through defined roles, procedures, and coordination mechanisms so messaging is timely, accurate, and controlled during an incident. A designated spokesperson is a core crisis-communications role because they provide the public-facing “voice” of the organization and personify the response to external audiences. The CDC’s Crisis & Emergency Risk Communication guidance describes the designated spokesperson as critical in a crisis and emphasizes that the spokesperson embodies the organization’s response for various audiences.

That aligns directly with option C: representing the organization at press conferences (and similar media interactions). Option A can be performed by communications advisors, but it is not the defining duty of the spokesperson role itself. Option B (writing social media for operational teams) is typically handled by communications staff under the communications lead, not necessarily the spokesperson. Option D (regulator post-incident reviews) is usually led by accountable executives, legal/compliance, and incident owners; the spokesperson may support, but it is not the primary spokesperson duty described in crisis-communications guidance.