Well, you need to give us the choices before we can give an exact answer but normally you can evaluate the tone by thinking about the context and meaning.
some examples of strong disapproval might be: "She's such a horrible person" or "I really hate this lamp it's ugly" The bolded words show the strong disapproval.
But most likely you should be able to find it by evaluating tone.
Most probably it's option A, because it sets the environment scary, and what all needed to make the story scary is environment & dialogues
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The speaker in the poem is Mother Nature.
