Avery, MacLeod, and McCarty (1944)demonstrated That DNA Was the Molecule

Avery, MacLeod, and McCarty (1944) demonstrated that DNA was the molecule of heredity by treating heat killed Streptococcus pneumoniae S (smooth) strain with DNase, thereby preventing transfer of the "transforming substance" from the killed S strain to the live R (rough) strain when the two were mixed together and injected into mice. Another way that one could demonstrate transformation in bacteria would be to extract DNA from

A) an ampicillin- sensitive strain and mix with cells of an ampicillin- resistant strain.
B) both S and R strains and mix to allow recombination to take place.
C) a S strain and mix with cells of a R strain.
D) a R strain and mix with cells of a S strain.
E) none of the above