I would say that "constant cry" and "Chesterton's cat" are the obvious ones. However "echoed in our ears" is a pretty subtle one that you can definitely make a solid argument for.
What would happen to long-term health if everyone had access to clean water? Is a good rhetorical question because you don't need to answer it, just maybe think about it.
Answer:
a. A i think so its A part and maybe also b part