The experiment performed by frederick griffith in the 1920s demonstrated that a)proteins contain genetic material responsible for infection. b)both the r-form and the s-form of the bacteria are virulent. c)bacteria are capable of undergoing gene transfers. d)all of the above

Your answer would be C.

In 1928 Frederic Griffth's experiment showed that bacteria were capable of transferring genetic information through a process called transformation. He mixed the r-form which did not kill with the S-form that killed its host. the s-form transformed the r-form to the more lethal s-form.