In the early 1950s,James Watson and Francis Crick ____.
A) were awarded the Nobel Prize for Medicine or Physiology B) combined all of their previous research in order to explain the structure of DNA C) began to work out the structure of DNA by organizing the information about DNA that was already available D) produced X-ray diffraction photographs from highly purified DNA samples E) isolated two strains of S. pneumoniae and used them to further research the structure of DNA