Final answer:
B) Dilation
An aneurysm is an abnormal dilation of the wall of an artery, which can lead to serious health complications if it ruptures.
Step-by-step explanation:
An aneurysm is an abnormal dilation of the wall of an artery. Arteries are blood vessels that carry oxygenated blood away from the heart. Normally, arteries have relatively thick walls that can withstand the high pressure of blood pumping from the heart. However, in the case of an aneurysm, a weakened area of the artery wall balloons out, forming a bulge. This bulge can put pressure on surrounding tissues and potentially rupture, leading to serious health complications.