What are three common causes that can lead to shock?

The correct answer highlights three important factors that can contribute to shock: injury, blood loss, and anxiety.

Injuries, particularly those that are severe or traumatic, can disrupt the normal physiological functions of the body. They can lead to shock by causing significant blood loss or by triggering a stress response in the body. Blood loss is critical since it reduces the volume of circulating blood, which in turn decreases the amount of oxygen reaching vital organs, leading to hypoperfusion and potential organ failure.

Anxiety plays a significant role as well. While anxiety itself may not cause physiological shock, it can exacerbate the body's response to stress and injuries, leading to hyperventilation and further complications. In some cases, individuals experiencing extreme anxiety may develop shock-like symptoms, compounding their reaction to physical stressors.

The other options include factors that do not align as directly with the typical causes of shock. For instance, while heat exhaustion and dehydration can lead to various medical issues, they do not encapsulate the same direct impact on blood circulation as the causes listed in the correct answer.