Which of the Following Statements About Germ-Line and Somatic Gene

Which of the following statements about germ-line and somatic gene therapy is not true?

A) Germ-line gene therapy has not been tried on humans.
B) Germ-line and somatic gene therapies have both been tested on animals.
C) Both gene therapies involve replacing a defective gene with a properly functioning version.
D) Both gene therapies are getting increasingly routine as disease treatments.
E) Somatic gene therapy has been successfully used to treat a genetic disease.