Experiments by Avery, MacLeod, and McCarty Supported DNA as the Genetic

Experiments by Avery, MacLeod, and McCarty supported DNA as the genetic material by showing that

A) both protein and DNA samples provided the transforming factor.
B) DNA has to be destroyed by DNase in order to transform the R bacteria.
C) DNA is not complex enough to be the genetic material.
D) only samples with DNA provided transforming activity.
E) even though DNA is molecularly simple, it provides adequate variation to act as the genetic material.