When an air bubble enters a vein, it's called a venous air embolism. When an air bubble enters an artery, it's called an arterial air embolism. These air bubbles can travel to your brain, heart, or lungs and cause a heart attack, stroke, or respiratory failure. Air embolisms are rather rare.
The ordinary work of Sigmund Freud affected the lives of ordinary people in the 20th century because it encouraged people to search for the hidden reasons for their actions. The correct answer is A.
