Read the following sentence and answer the question. My mother and sister still do not understand each other.

Which of the following modifies the sentence above using an adverbial phrase?

A) My mother and sister, understanding their differences, still do not talk to each other.
B)My mother and sister still do not understand each other, in spite of thirty years of living together.
C) My mother still does not understand my sister and my sister still does not understand my mother.
D) Their back turned, their mouths closed, my mother and sister still do not understand each other.