When the nurse attempts to teach self-administration of insulin injections to a client who is newly diagnosed with type 1 diabetes mellitus (DM), the client tells the nurse in a loud voice to leave the room. Which action should the nurse take?

A. While encouraging relaxation techniques can be helpful, the client’s immediate expression of frustration indicates a need for the nurse to respect their request. B. Referring the client to a social worker may be beneficial in the long term but does not address the immediate situation. C. Leaving the client’s room and returning later respects the client's wishes and allows for a more conducive environment for teaching when the client is ready. D. Explaining the importance of insulin may not be effective if the client is currently unwilling to engage in the discussion.