To Show That DNA Is the "Transforming Principle," Avery, MacLeod

To show that DNA is the "transforming principle," Avery, MacLeod, and McCarty showed that DNA could transform nonvirulent strains of pneumococcus. Their hypothesis was strengthened by their demonstration that

A) enzymes that destroy proteins also destroy transforming activity.
B) enzymes that destroy nucleic acids also destroy transforming activity.
C) enzymes that destroy complex carbohydrates also destroy transforming activity.
D) the transforming activity is destroyed by boiling.
E) other strains of bacteria also can be transformed successfully.