A client with a history of unstable angina presents to the emergency department with constant chest pressure that is unrelieved with rest. The client appears anxious, pale, and diaphoretic. After obtaining the client's vital signs, which action should the nurse take next?

Choice A reason: Placing an indwelling urinary catheter and instituting strict intake and output measurements can be done later if needed, but addressing the chest pain is the priority.Choice B reason: Securing consent for coronary angiography and intervention is important but should be done after addressing the immediate chest pain and potential myocardial infarction.Choice C reason: Administering aspirin is crucial as it acts as an antiplatelet agent, helping to reduce the risk of further clot formation and improving outcomes in the setting of acute coronary syndrome.Choice D reason: Evaluating extremities for perfusion is important but secondary to administering aspirin in this acute situation.