Walking down stairs is the activity least likely to precipitate an angina attack among the options given, as it generally involves less exertion compared to the other factors.
Factors that may precipitate an angina attack typically involve stress on the heart or conditions reducing blood flow and oxygen to the heart muscle. Among the options provided, walking down stairs is least likely to cause an angina attack in the majority of patients with stable angina, as it does not usually present the same level of physical exertion or environmental stress that typically provoke angina. Contrastingly, eating a large meal can increase the heart's workload, an angry argument can raise blood pressure and stress levels, and shoveling snow, especially in cold and windy conditions, is a strenuous activity that can significantly increase the demand for oxygen by the heart muscle.