Final answer:
Sunbathing is the activity least likely to cause anginal pain, as it is a passive activity that does not significantly stress the cardiovascular system compared to the other activities listed, which involve exertion or emotional stress.
Step-by-step explanation:
Angina is a condition typically characterized by chest pain as a result of reduced blood flow to the heart muscle, leading to inadequate oxygen supply. Among the activities listed, sunbathing stands out as the activity least likely to induce anginal pain. Angina is often triggered by physical exertion, emotional stress or medical conditions that put a strain on the heart, such as febrile respiratory infections. However, sunbathing, which involves lying quietly in the sun, normally does not exert the cardiovascular system in a way that would cause the heart to require extra oxygen and therefore is unlikely to cause angina.
Activities that may induce angina include getting angry, which can raise blood pressure and heart rate; febrile respiratory infections, which increase the body's demand for oxygen and put more strain on the heart; and running up stairs, which is a form of physical exertion. Conversely, sunbathing is a passive activity unlikely to cause the stress to the cardiovascular system that would precipitate anginal pain.