Final answer:
The early sign of shock in a postpartum client who is bleeding is restlessness due to insufficient blood flow and oxygenation to the brain.
Step-by-step explanation:
The early signs of shock, particularly in a postpartum client who is bleeding, can include symptoms such as restlessness, a rapid heart rate, a weak pulse, cool and clammy skin, rapid and shallow breathing, and low urine output. Restlessness is an early sign of hypovolemic shock due to the brain's reaction to insufficient blood flow and oxygenation. Hence, the correct answer to the question 'The nurse is monitoring a postpartum client who is bleeding for signs of shock. Which indicates an early sign of shock?' is C. Restlessness.
It is important to note that increased blood pressure and bradycardia are not typically early signs of circulatory shock induced by bleeding. Increased blood pressure might not occur until compensatory mechanisms kick in or may not happen at all. Cool, clammy skin, not warm extremities, would be expected as the shock progresses.