A theme is what the author wants you to get from the story only one does this, which is A
Answer:
The brain/human mind is c) wide, deep and weighty
Explanation:
Dickinson explores how complex and special the mind is as she compares it to the sky's limit and the depths of the ocean (various posibilities of physical dimension) , and the weight of God (spiritual dimension).
Your asnwer is A :) :) :) :)