Griffith's experiment was performed in 19328 by Frederick Griffith.
In this experiment, Griffith used two strains of the pneumococcus that caused pneumonia, one that was virulent and another that wasn't virulent.
His experiment showed that bacterias can transfer genetic information among them, which he called "transformation.
This means A) pneumonia is the right answer.
Aditionally, HIV is caused by a virus, not a bacteria;