A) The radioactive viruses (coats plus DNA) were in the pellet.
B) The radioactive viruses were in the pellet, and the bacteria were in the supernatant.
C) The bacteria were in the pellet, and they had incorporated radioactive proteins into their cell membranes.
D) The radioactive protein coats of the viruses were in the pellet.
E) The bacteria were in the pellet, and many contained the radioactive viral DNA.