Estoy PREUCUPADO por Diego.
I am worried about Diego.
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.
Bajos debido a que se expresa en plural
Ñ and N i think if not try M