Which Part of the DNA Strand Is the MOST Polar

Multiple Choice

Which part of the DNA strand is the MOST polar, and what is the significance of that polarity?

A) The nitrogen base is most polar, and so it is on the outside of the DNA, in contact with water.
B) The nitrogen base is most polar, and so it is on the inside of the DNA.
C) The sugar phosphate backbone is most polar, and so it is on the outside of the DNA, in contact with water.
D) The sugar phosphate backbone is most polar, and so it is on the inside of the DNA.
E) No part of DNA is any more polar than any other part.