Answer:
A= las cascadas
Explanation:
las cascadas are waterfalls.
The sentence basically talks about someone being scared when they saw
[ blank ] of water going down the river. The only one that can make sense is waterfalls. So it is A.
Lanzar because it means to throw
Does the question have a picture or anything? you can't describe something if your not feeling it, seeing, or smelling it.