Final answer:
In the case of a nurse caring for a client experiencing hypovolemic shock, the next action after notifying the provider should be to administer oxygen at 10 L/min (Option C).
Step-by-step explanation:
In the case of a nurse caring for a client experiencing hypovolemic shock, the next action after notifying the provider should be to administer oxygen at 10 L/min (Option C). Hypovolemic shock is caused by excessive loss of blood volume, and oxygen administration helps to improve tissue oxygenation. Massage of the client's fundus (Option A) and insertion of an indwelling urinary catheter (Option B) are not immediate priorities in the management of hypovolemic shock. Elevating the client's right hip (Option D) is not indicated in this situation.