You Are Carrying Out Experiments Designed to Utilize DNA Encoding

You are carrying out experiments designed to utilize DNA encoding a wild-type gene to treat a disease resulting from inheritance of a defective gene. Which of the following techniques would be the most useful in pursuit of the goal of these studies?

A) gene therapy
B) polymerase chain reaction, PCR
C) restriction fragment length polymorphism, RFLP
D) RNAi
E) transgenesis