Nevado Ojos del Salado is primarily known for being the highest active volcano in the world, and while its height is a significant aspect, it is also notable for other features. Among the options you provided, the most relevant would be:
- The highest lake in the world located near its peak: The mountain is home to the highest permanent body of water on Earth, which is a crater lake called "La Laguna Verde."
The other options, like extreme volcanic activity, numerous ski resorts, and an annual pilgrimage, do not accurately characterize Ojos del Salado. It's not known for extreme volcanic activity (as it is currently considered dormant) or ski resorts, and while there may be some cultural events related to the area, a specific pilgrimage is not a widely recognized aspect of this mountain.