The author compares imagination to a soaring bird in this poem (A). For example, the text states that "Or who describe the swiftness of thy course? Soaring through air to find the bright abode . . ." This quote from the text supports that the author uses imagination to refer to a soaring bird flying swiftly in the air.
She is a savage that is why
The answer to that question is: D) Invisible
I would say that it's the second option. There is little that protects sinners from God's fury I infer this because one of Edward's sermons mention something of being in the hands of an "Angry God".