Option 1 -> "spuriously" means falsely or not genuinely, which doesn't fit the context of real injuries.
Option 2 -> "gravely" means seriously or severely, which appropriately describes life-threatening injuries.
Option 3 -> "fatefully" relates to fate or destiny, but doesn't describe the severity of injuries.
Option 4 -> "vitally" means essentially or relating to life, but "vitally injured" is not a proper collocation.
Hence, Option 2: gravely -> The word "gravely" correctly conveys the seriousness of the injuries, which is evident from the fact that some tourists died on the way to the hospital. "Gravely injured" is the standard expression for describing severe, life-threatening injuries -> correct