From the DNA X-ray crystallography data, Franklin and Wilkins inferred that ____, while Watson and Crick determined that ____.

A) purines and pyrimidines exist in a 1:1 ratio; DNA is helical
B) phosphates are stacked liked rungs on a ladder; DNA is helical
C) DNA is helical; DNA is the genetic material
D) DNA is helical; the flat nucleotide bases are stacked upon each other
E) the flat nucleotide bases are stacked upon each other; DNA is helical.