In Griffith's Transformation Experiments

In Griffith's transformation experiments,

A) mice infected with live R form caused pneumonia and death in the mice.
B) the R form transformed the S form into a virulent variety.
C) mice infected with heat-killed S form and live R form caused pneumonia and death in the mice.
D) the S form lacked an enzyme involved in the manufacture of the polysaccharide coat,leading to the abnormally smooth colonies.