Griffith's Experiments Showing the Transformation of R Strain Pneumococcus Bacteria

Multiple Choice

Griffith's experiments showing the transformation of R strain pneumococcus bacteria to S strain pneumococcus bacteria in the presence of heat-killed S strain bacteria provided evidence that

A) an external factor was affecting the R strain bacteria.
B) DNA was definitely the transforming factor.
C) S strain bacteria could be reactivated after heat killing.
D) S strain bacteria required special genes to be pathogenic.
E) All of the above