Fred Griffith's experiment,in which he used two strains of Streptococcus pneumoniae,demonstrated that _____.  

A) pathogenic bacteria function differently in mice than in other organisms
B) harmless bacteria can become transformed into disease-causing bacteria by a bacteria transformation factor
C) pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains
D) dead cells lose their genetic information
E) DNA is a protein rich in nitrogen and phosphorus