Option 1 -> "revel" means to enjoy oneself or celebrate, which doesn't describe a river's movement.
Option 2 -> "wind" means to twist and turn along a path, which is very similar to meander.
Option 3 -> "swing" means to move in a curving or back-and-forth motion, describing the river's flowing curves.
Option 4 -> "wrap" means to cover or enclose something, which doesn't fit the context of a river's path.
Hence, Option 3: swing -> While "wind" is also very close, "swing" captures the smooth, curving back-and-forth motion of a river as it makes its serpentine journey to the sea, which aligns well with how rivers meander through landscapes -> correct
  This was the only answer as per NTA. Only option 3 was awarded marks.