Final answer:
Pulmonary embolism, which occurs when a blood clot blocks the pulmonary arteries in the lungs, is the major cause of death that occurs in 1 in every 2,000 pregnancies.
Step-by-step explanation:
The condition referred to in the question that occurs in 1 in every 2,000 pregnancies and is a major cause of death is pulmonary embolism (A). Pulmonary embolism happens when a blood clot, often from a deep vein thrombosis (DVT), travels to the lungs and obstructs the pulmonary arteries. This can lead to severe consequences including lung damage and death due to the disruption of blood flow and gas exchange in the lungs. Pregnancy-related mortality ratio, the number of pregnancy-related deaths per 100,000 live births, gives us an indication of the severity of such conditions.