Final answer:
Stable angina is characterized by chest discomfort that is precipitated by exertion and improves quickly with rest or nitroglycerin. The situation that correlates with stable angina is chest discomfort when mowing the lawn and subsiding with rest.
Step-by-step explanation:
Stable angina is characterized by chest discomfort that is precipitated by exertion and improves quickly with rest or the administration of nitroglycerin. In this case, the situation that correlates with stable angina is option b: chest discomfort when mowing the lawn and subsiding with rest. This is because the chest discomfort is brought on by exertion (mowing the lawn) and improves with rest.