Griffith's Experiments, Which Showed the Transformation of R Strain Pneumococcus

Multiple Choice

Griffith's experiments, which showed 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) a factor from S strain was modifying the R strain bacteria.
B) DNA was definitely the transforming factor.
C) heat-killed S strain bacteria could be reactivated.
D) S strain bacteria are resistant to heat-killing.
E) R strain bacteria are resistant to heat-killing.