A client is experiencing a panic attack characterized by intense fear, hyperventilation, chest pain, and feelings of impending doom. Which nursing intervention is most appropriate to help the client during this panic stage?

Administer a sedative medication.

Encourage the client to talk about their feelings and provide a quiet environment to reduce stimulation.

Engage the client in detailed problem-solving to distract from the anxiety.

Allow the client to express feelings fully without offering any guidance or redirection.