Correct Option: C

Nose bleeds can occur at high altitudes. The bleeding may be caused by the change in air pressure associated with the change in altitude or the cold dry air common at high altitudes. No matter the cause, the symptoms and treatment of a high altitude bloody nose are the same. A nose bleed is defined as the discharge of blood from the nostrils. Stress and anxiety raises the blood pressure, complicating the nose bleed. At high elevations, there’s less oxygen in the air for us to breathe in. When we travel from a low elevation to a high one, our body needs time to adjust to the lower levels of oxygen reaching your bloodstream. Eventually, our respiration and heart activity increase and we produce more red blood cells to transport the oxygen to where it needs to go.