In a Series of Experiments, DNA Was Extracted from Pneumonia-Causing

In a series of experiments, DNA was extracted from pneumonia-causing bacteria and added to a tube containing mutant bacteria of the same species. The mutants had lost the ability to cause pneumonia. Mice were injected with either the mixture or with the mutant strain. Only the mice injected with the mixture died. The results can be best be explained by

A) transduction.
B) transformation.
C) conjugation.
D) mutation.
E) transfection.

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