Final answer:
Increased pulmonary artery pressure results in increased right ventricular workload and cor pulmonale, a form of right-sided heart failure.
Step-by-step explanation:
The most likely result of increased pulmonary artery pressure is B) Increased right ventricular workload and cor pulmonale. The pulmonary artery is responsible for carrying deoxygenated blood from the right side of the heart to the lungs for oxygenation. When there is increased pressure in the pulmonary artery, the right ventricle must work harder to pump blood through the lungs. This increased workload on the right ventricle can lead to a condition known as cor pulmonale, which is essentially right-sided heart failure due to lung pathology.