Final answer:
The Purple Heart's criteria were expanded on 15 October 1980 to include those wounded indirectly by enemy action in addition to those wounded directly.
Step-by-step explanation:
To identify the correct date after which an individual who was wounded, either as a direct or indirect result of enemy action, could be eligible for the Purple Heart, it's important to know the specific historical regulations related to military service awards. The Purple Heart is a United States military decoration awarded to those wounded or killed while serving. For the purpose of this question, the specific date in question would be when the award's criteria were broadened to include not only those wounded directly by enemy action but also those wounded indirectly.
The Purple Heart was originally established by George Washington in 1782 and was then known as the Badge of Military Merit. Its modern criteria and design date to 1932. It has undergone various changes throughout history. After World War II and the Korean War, eligibility for the award was expanded.
The correct answer to the question is: d) 1980. On 15 October 1980, the criteria for awarding the Purple Heart were further expanded to include individuals wounded as an indirect result of enemy action.