What condition is characterized by inadequate venous circulation due to blocked veins?

Chronic venous insufficiency is the correct choice because it specifically refers to a condition where there is inadequate venous circulation resulting from blocked or damaged veins, particularly in the legs. This condition often leads to symptoms such as swelling, pain, and the development of varicose veins due to the inability of blood to efficiently return to the heart. Over time, this inadequate circulation can lead to complications such as skin changes or even ulcers.

The other conditions listed do not primarily relate to venous circulation issues. Myocardial infarction, commonly known as a heart attack, pertains to interrupted blood flow to the heart muscle. A cerebrovascular accident, or stroke, involves the interruption of blood supply to the brain. Pulmonary embolism involves a blockage in the pulmonary arteries of the lungs, typically caused by blood clots, and while it does relate to the circulatory system, it does not specifically address the problems arising from blocked veins in the context of chronic venous insufficiency.