Monotone means having no expression in your voice, no anger, no happiness, no interest. This word would affect the tone by giving the reader the feeling that he just doesn't care about what is going on/ what he's talking about. I hope this helped!
I think the answer is B. I think the monsters could be representing a problem that someone is currently going through and at the end, their eyes point towards the coast and the conflict seems to disperse.
Blue earth is a adegective with the world