Demetrius Vikelas is known for being which of the following?

Demetrius Vikelas is recognized as the first President of the International Olympic Committee (IOC). He played a crucial role in the revival of the Olympic Games in 1896, which marked the beginning of the modern Olympic era. His leadership was instrumental in organizing the first modern Olympics in Athens, where he helped facilitate the collaboration between various nations and promote the values of the Olympic Movement. This historical significance is why the correct answer is that he is the first IOC President, establishing a foundation for the future governance of the Olympic Games. The other options do not accurately reflect Vikelas's contributions or achievements.