Martha's Friend, Ruby, Is a Professional Artist

Martha's friend, Ruby, is a professional artist. Martha spends a lot of time with Ruby at the gallery. One day, Ruby asks Martha to help her paint a particular section of the wall to serve as a backdrop for her latest work of art. After observing Martha's brush strokes, Ruby tells Martha that she must consider pursuing a career in art and that she has a lot of untapped potential. Martha decides to follow her friend's advice. After a few weeks of practicing, Martha discovers that she is good at painting and decides to continue this newfound hobby. Which of the following is true of this scenario?

A) Ruby's feedback increased the size of Martha's unknown pane.
B) Ruby's feedback reduced the size of Martha's blind pane.
C) Ruby's feedback increased the size of Martha's blind pane.
D) Ruby's feedback reduced the size of Martha's open pane.