Option 1 -> The Seine is the iconic river that flows through Paris, France, and was central to the 2024 Olympics opening ceremony and several events.
Option 2 -> The Thames flows through London, UK, not Paris, and was associated with the 2012 London Olympics.
Option 3 -> The Colorado River is located in the southwestern United States, nowhere near Paris or France.
Option 4 -> The Nile flows through northeastern Africa, primarily Egypt and Sudan, not through Paris.
Hence, Option 1: Seine -> The Paris 2024 Olympics made historic use of the Seine River, hosting the opening ceremony on the river itself with boats carrying athletes, and conducting open water swimming and triathlon events in its waters -> correct