A I think I am just guess ok its A
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.
Escriba su nombre is the answer
Who = Quien
What = que
When = cuando
Where = donde
Why = porque
How = como
Which = cual
How much = cuanto